In order to activate WebRTC, you need to add the following code to your website's header:
ZiggeoApi.Config.webrtc = true;
Make sure to user a browser that supports WebRTC like Chrome, Firefox or Opera.
If your browser is still using Flash instead of WebRTC, chances are that you are accessing the website using http instead of https. Newer versions of the browsers mentioned above do not grant access to WebRTC without using SSL.