diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5cf38f3b..8999623c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,8 +9,9 @@ Repository: **<git+https://github.com/vladmandic/human.git>**
 
 ## Changelog
 
-### **HEAD -> main** 2021/05/24 mandic00@live.com
+### **HEAD -> main** 2021/05/25 mandic00@live.com
 
+- implemented unified result.persons that combines face, body and hands for each person
 - added experimental results interpolation for smooth draw operations
 
 ### **1.9.3** 2021/05/23 mandic00@live.com
diff --git a/demo/index.js b/demo/index.js
index 9a7fcc89..f14911c5 100644
--- a/demo/index.js
+++ b/demo/index.js
@@ -304,10 +304,19 @@ async function setupCamera() {
     ui.busy = false;
     return msg;
   }
+  // enumerate devices for diag purposes
+  const devices = await navigator.mediaDevices.enumerateDevices();
+  log('enumerated devices:');
+  for (const device of devices) log(`  kind:${device.kind} label:${device.label} id:${device.deviceId}`);
+
   let stream;
   const constraints = {
     audio: false,
-    video: { facingMode: ui.facing ? 'user' : 'environment', resizeMode: ui.crop ? 'crop-and-scale' : 'none' },
+    video: {
+      facingMode: ui.facing ? 'user' : 'environment',
+      resizeMode: ui.crop ? 'crop-and-scale' : 'none',
+      // deviceId: 'xxxx' // if you have multiple webcams, specify one to use explicitly
+    },
   };
   if (window.innerWidth > window.innerHeight) constraints.video.width = { ideal: window.innerWidth };
   else constraints.video.height = { ideal: (window.innerHeight - document.getElementById('menubar').offsetHeight) };
@@ -328,8 +337,19 @@ async function setupCamera() {
     ui.busy = false;
     return 'camera stream empty';
   }
+  const tracks = stream.getVideoTracks();
+  if (tracks && tracks.length >= 1) {
+    if (tracks.length >= 1) {
+      log('enumerated viable tracks:', tracks.length);
+      for (const t of tracks) log(`  ${t.kind}: ${t.label}`);
+    }
+  } else {
+    ui.busy = false;
+    return 'no camera track';
+  }
   const track = stream.getVideoTracks()[0];
   const settings = track.getSettings();
+  log('selected camera:', track.label, 'id:', settings.deviceId);
   // log('camera constraints:', constraints, 'window:', { width: window.innerWidth, height: window.innerHeight }, 'settings:', settings, 'track:', track);
   ui.camera = { name: track.label.toLowerCase(), width: settings.width, height: settings.height, facing: settings.facingMode === 'user' ? 'front' : 'back' };
   return new Promise((resolve) => {
diff --git a/package.json b/package.json
index a630a7d2..df405b6e 100644
--- a/package.json
+++ b/package.json
@@ -67,8 +67,8 @@
     "@vladmandic/pilogger": "^0.2.17",
     "canvas": "^2.8.0",
     "chokidar": "^3.5.1",
-    "dayjs": "^1.10.4",
-    "esbuild": "^0.12.2",
+    "dayjs": "^1.10.5",
+    "esbuild": "^0.12.3",
     "eslint": "^7.27.0",
     "eslint-config-airbnb-base": "^14.2.1",
     "eslint-plugin-import": "^2.23.3",
diff --git a/server/build.log b/server/build.log
index dd59a0b5..d3b74f40 100644
--- a/server/build.log
+++ b/server/build.log
@@ -1,17 +1,17 @@
-2021-05-25 08:45:35 INFO:  @vladmandic/human version 1.9.3 
-2021-05-25 08:45:35 INFO:  User: vlado Platform: linux Arch: x64 Node: v16.0.0 
-2021-05-25 08:45:35 INFO:  Build: file startup all type: production config: {"minifyWhitespace":true,"minifyIdentifiers":true,"minifySyntax":true} 
-2021-05-25 08:45:35 STATE: Build for: node type: tfjs: {"imports":1,"importBytes":102,"outputBytes":1292,"outputFiles":"dist/tfjs.esm.js"} 
-2021-05-25 08:45:35 STATE: Build for: node type: node: {"imports":37,"importBytes":431051,"outputBytes":385549,"outputFiles":"dist/human.node.js"} 
-2021-05-25 08:45:35 STATE: Build for: nodeGPU type: tfjs: {"imports":1,"importBytes":110,"outputBytes":1300,"outputFiles":"dist/tfjs.esm.js"} 
-2021-05-25 08:45:35 STATE: Build for: nodeGPU type: node: {"imports":37,"importBytes":431059,"outputBytes":385553,"outputFiles":"dist/human.node-gpu.js"} 
-2021-05-25 08:45:35 STATE: Build for: nodeWASM type: tfjs: {"imports":1,"importBytes":149,"outputBytes":1367,"outputFiles":"dist/tfjs.esm.js"} 
-2021-05-25 08:45:35 STATE: Build for: nodeWASM type: node: {"imports":37,"importBytes":431126,"outputBytes":385625,"outputFiles":"dist/human.node-wasm.js"} 
-2021-05-25 08:45:35 STATE: Build for: browserNoBundle type: tfjs: {"imports":1,"importBytes":2478,"outputBytes":1394,"outputFiles":"dist/tfjs.esm.js"} 
-2021-05-25 08:45:35 STATE: Build for: browserNoBundle type: esm: {"imports":37,"importBytes":431153,"outputBytes":236268,"outputFiles":"dist/human.esm-nobundle.js"} 
-2021-05-25 08:45:36 STATE: Build for: browserBundle type: tfjs: {"modules":1274,"moduleBytes":4114813,"imports":7,"importBytes":2478,"outputBytes":1111414,"outputFiles":"dist/tfjs.esm.js"} 
-2021-05-25 08:45:36 STATE: Build for: browserBundle type: iife: {"imports":37,"importBytes":1541173,"outputBytes":1344154,"outputFiles":"dist/human.js"} 
-2021-05-25 08:45:36 STATE: Build for: browserBundle type: esm: {"imports":37,"importBytes":1541173,"outputBytes":1344146,"outputFiles":"dist/human.esm.js"} 
-2021-05-25 08:45:36 INFO:  Generate types: ["src/human.ts"] 
-2021-05-25 08:45:41 INFO:  Update Change log: ["/home/vlado/dev/human/CHANGELOG.md"] 
-2021-05-25 08:45:41 INFO:  Generate TypeDocs: ["src/human.ts"] 
+2021-05-26 07:57:03 INFO:  @vladmandic/human version 1.9.3 
+2021-05-26 07:57:03 INFO:  User: vlado Platform: linux Arch: x64 Node: v16.0.0 
+2021-05-26 07:57:03 INFO:  Build: file startup all type: production config: {"minifyWhitespace":true,"minifyIdentifiers":true,"minifySyntax":true} 
+2021-05-26 07:57:03 STATE: Build for: node type: tfjs: {"imports":1,"importBytes":102,"outputBytes":1292,"outputFiles":"dist/tfjs.esm.js"} 
+2021-05-26 07:57:03 STATE: Build for: node type: node: {"imports":37,"importBytes":431051,"outputBytes":385549,"outputFiles":"dist/human.node.js"} 
+2021-05-26 07:57:03 STATE: Build for: nodeGPU type: tfjs: {"imports":1,"importBytes":110,"outputBytes":1300,"outputFiles":"dist/tfjs.esm.js"} 
+2021-05-26 07:57:03 STATE: Build for: nodeGPU type: node: {"imports":37,"importBytes":431059,"outputBytes":385553,"outputFiles":"dist/human.node-gpu.js"} 
+2021-05-26 07:57:03 STATE: Build for: nodeWASM type: tfjs: {"imports":1,"importBytes":149,"outputBytes":1367,"outputFiles":"dist/tfjs.esm.js"} 
+2021-05-26 07:57:03 STATE: Build for: nodeWASM type: node: {"imports":37,"importBytes":431126,"outputBytes":385625,"outputFiles":"dist/human.node-wasm.js"} 
+2021-05-26 07:57:03 STATE: Build for: browserNoBundle type: tfjs: {"imports":1,"importBytes":2478,"outputBytes":1394,"outputFiles":"dist/tfjs.esm.js"} 
+2021-05-26 07:57:03 STATE: Build for: browserNoBundle type: esm: {"imports":37,"importBytes":431153,"outputBytes":236268,"outputFiles":"dist/human.esm-nobundle.js"} 
+2021-05-26 07:57:04 STATE: Build for: browserBundle type: tfjs: {"modules":1274,"moduleBytes":4114813,"imports":7,"importBytes":2478,"outputBytes":1111414,"outputFiles":"dist/tfjs.esm.js"} 
+2021-05-26 07:57:04 STATE: Build for: browserBundle type: iife: {"imports":37,"importBytes":1541173,"outputBytes":1344154,"outputFiles":"dist/human.js"} 
+2021-05-26 07:57:05 STATE: Build for: browserBundle type: esm: {"imports":37,"importBytes":1541173,"outputBytes":1344146,"outputFiles":"dist/human.esm.js"} 
+2021-05-26 07:57:05 INFO:  Generate types: ["src/human.ts"] 
+2021-05-26 07:57:10 INFO:  Update Change log: ["/home/vlado/dev/human/CHANGELOG.md"] 
+2021-05-26 07:57:10 INFO:  Generate TypeDocs: ["src/human.ts"]