With V2 the WebRTC is the default. If you are using V2 and 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 do not grant access to WebRTC without using SSL.
While the WebRTC is the default with V2 the Flash is still used as the fallback. If you see the Flash being used and you are recording over https it means that WebRTC was not possible to be used.