MediaStreamConstraints dictionary is used when calling
getUserMedia() to specify what kinds of tracks should be included in the returned
MediaStream, and, optionally, to establish constraints for those tracks' settings.
DOMString identifying the peer who has sole access to the stream. If this property is specified, only the indicated peer can receive and use the stream. Streams isolated in this way can only be displayed in a media element (
video) where the content is protected just as if
CORS cross-origin rules were in effect. When a peer identity is set,
MediaStreamTracks from that peer have their
MediaStreamTrack.isolated flag set to