Once arbitrary data can be sent through peer connections via a browser javascript application, then there is no reason why the BitTorrent Live protocol (or some other similar P2P streaming protocol) could not work over WebRTC.
One difficulty I see is actually getting the binary data into a <video> element. It would be in theory possible to write to the file in the HTML5 FileSystem API and point the video element to it, but that would require transmitting the stream in a way that is ameliorable to seeming like a static video on disk.
One difficulty I see is actually getting the binary data into a <video> element. It would be in theory possible to write to the file in the HTML5 FileSystem API and point the video element to it, but that would require transmitting the stream in a way that is ameliorable to seeming like a static video on disk.