title: WebRTC: How to add stream after offer and answer?
body: <p>I am working on webRTC video calling. I got datachannel successfully implemented. Now I would like to add video stream to the same peer connection. </p>
  
  <p>I have read that stream should be added before answer and offer. Is there a way to add stream after answer or offer?</p>
  
  <p>In case I have added stream before offer or answer, how could I stop streaming and start it again when needed?</p>
  
  <p>Could there be any issues in maintaining so many streams?</p>