code: function tryStart() {
    if (started) {
      return;
    }
    started = true;
  
    var video = document.createElement('video');
    video.src = '//www.marzipano.net/media/video/mercedes-f1-1280x640.mp4';
    video.crossOrigin = 'anonymous';
  
    video.autoplay = true;
    video.loop = true;
  
    // Prevent the video from going full screen on iOS.
    video.playsInline = true;
    video.webkitPlaysInline = true;
  
    video.play();
  
    waitForReadyState(video, video.HAVE_METADATA, 100, function() {
      waitForReadyState(video, video.HAVE_ENOUGH_DATA, 100, function() {
        asset.setVideo(video);
      });
    });
  }
docs: Try to start playback.