var client = new Twilio.Video.Client(token);
var localMedia = new Twilio.Video.LocalMedia();

localMedia.addStream(videoStream);
localMedia.addStream(screenStream);

console.log('sending local track', videoStream.getVideoTracks()[0]);
console.log('sending local track', screenStream.getVideoTracks()[0]);

client.connect({to: roomName, localMedia: localMedia})
.then(function(room) {
  room.on('participantConnected', function (participant) {
    participant.on('trackAdded', function(track) {
      console.log('received remote track', track.mediaStreamTrack );
    });
  });
});