If you are running in the browser, you need to use Flash Player, not AIR.
Have a look at the NetConnection, NetStream, Camera, and Video classes. These work in both Flash Player (in the browser) or AIR (on the desktop).
But i think flash doesn't support RTP?? Or they have a support for RTP??
If yes can you tell me how?
It looks like RTP and RTCP are built on UDP. If that is correct, then you couldn’t use Flash to implement either protocol. AIR does support UDP, so it might be possible to program support for the RTP protocol in an AIR app, but this isn't supported directly.
Adobe does have the Flash FMS server and RTMP which solve the same problem, but if you already have the server-side nailed down, then that is somewhat irrelevant.