Implementing webbased real time video chat using HTML5 websockets

Does anyone know how to implement voice/video over IP in a webapplication using HTML5 websockets?

It would be nice if I could implement this with PHP or Python since I (unfortunately) don't know any other programming language at the moment.

A good tutorial will do, as well as an already-build-solution which I have to pay for.

Update1:
Added video because it's not only audio/voip related.

Update2:
First HTML5 Video Conference App is already created. See my own answer