Hello, I think you can use the useVLC in embedded mode
In recent forks of MMM-RTSPStream, VLC can be embedded into the  browser view with an  iframe  or  HTML5  video  tag, which respects DOM positioning. Check the fork you’re using. If it’s still spawning standalone VLC, look for configuration like:
localPlayer: ‘ffmpeg’   // instead of ‘vlc’
Some forks added ffmpeg or jsmpeg options to push the stream into a  element.