switch_camera.js

switchVideoinput: function(mediaDeviceId, callbacks){

  // removes the video track from both MediaStream and PeerConnection sender
  videoRoomPlugin.webrtcStuff.myStream.removeTrack(videoRoomPlugin.webrtcStuff.myStream.getVideoTracks()[0]);
  videoRoomPlugin.webrtcStuff.pc.removeTrack(videoRoomPlugin.webrtcStuff.pc.getSenders()[1])
  
  // does a new getUserMedia just for video
  var constraints = {
    audio: false,
    video: {deviceId: {exact: mediaDeviceId}}
  };
  
  navigator.mediaDevices.getUserMedia(constraints)
   .then(function(stream) {
    
      // adds the new resulting video track to both MediaStream and PeerConnection
      videoRoomPlugin.webrtcStuff.pc.addTrack(stream.getVideoTracks()[0], stream);
      videoRoomPlugin.webrtcStuff.myStream.addTrack(stream.getVideoTracks()[0]);
    
      videoRoomPlugin.createOffer({video: {deviceId: mediaDeviceId}, replaceVideo: true}, {
        success: function(jsep) {
          videoRoomPlugin.send({message: {request: "configure"}, "jsep": jsep});
        },
        error: function(error){
          callbacks.error(error);
        }
      });
   })
   .catch(function(error) {
     callbacks.error(error);
   }); 
}