Exposing active track to API

src/input/camera_access.js

@@ -87,6 +87,15 @@ function enumerateVideoDevices() {
     .then(devices => devices.filter(device => device.kind === 'videoinput'));
 }
 
+function getActiveTrack() {
+    if (streamRef) {
+        const tracks = streamRef.getVideoTracks();
+        if (tracks && tracks.length) {
+            return tracks[0];
+        }
+    }
+}
+
 export default {
     request: function(video, videoConstraints) {
         return pickConstraints(videoConstraints)
@@ -101,11 +110,8 @@ export default {
     },
     enumerateVideoDevices,
     getActiveStreamLabel: function() {
-        if (streamRef) {
-            const tracks = streamRef.getVideoTracks();
-            if (tracks && tracks.length) {
-                return tracks[0].label;
-            }
-        }
-    }
+        const track = getActiveTrack();
+        return track ? track.label : '';
+    },
+    getActiveTrack
 };