You can use the Red5 Pro WebRTC SDK to develop your browser-based application. The Red5 Pro HTML5 Streaming Example App contains a simple project with a number of examples that can be used for testing and reference with the Red5 Pro WebRTC SDK.

The app is also included as a webapp with the server release for developer testing, and can be accessed at https://<your_server_ip>/webrtcexamples/ (or http://localhost:5080/webrtcexamples/ if you are running the server locally).

You will find some more details on the Red5 Pro WebRTC SDK here