Done in Html5 P2P 1-way video stream:
Meaning there is on a url a div which contains a videostream (live) from a cam.
With Two-way ajax chat
Meaning the other persons/users can interact with the person on the video stream through simle ajax chat (open source). The Chat between multiple Users and the Videolivestram-Person takes place in ONE chatroom where everybody sees everything.
The Users don't have "to allow" anything because P2P is only 1-way and the ajax chat (serverside) doesnt require that.