The below SDP is recreated using the following steps:
- Participant A offers audio+video to Participant B
- B answers with audio+video
- Call connected.
- A renegotiates to remove audio, making it a video-only call from it's side
- calls getUserMedia with
{ audio: false, video: true }
- calls getUserMedia with
- removes all streams from the peer connection, and adds the stream from getUserMedia