1. @DomName('VideoTrackList.getTrackById')
  2. @DocsEditable()
  3. @Experimental()
VideoTrack getTrackById(String id)

Source 

@DomName('VideoTrackList.getTrackById')
@DocsEditable()
@Experimental() // untriaged
VideoTrack getTrackById(String id) =>
    _blink.BlinkVideoTrackList.instance.getTrackById_Callback_1_(this, id);