How to stream live video in HTML5?

I'm looking for a way to broadcast a live video taken from a webcam or camera rooted to a PC. The broadcast should be displayed in a HTML5 page using the tag (which support rtp, and rtsp I think).

The user viewing the stream should not have to install any plug-in or video player such as QuickTime.

I need the video to be in mp4 format such as: rtsp://www.mywebsite/streaming/video.mp4

This would be the link I'd put as the src of the html 5 video tag.

So I'd like to know if it's possible, what are my options to do such things.