sgcWebSockets supports WebRTC using WebBrowser as client.
But there is another option if you don't want to use a WebBrowser as client, you can embed chrome browser in your application and connect to a WebRTC online Server.
This demo uses CEF4Delphi library to embed Chromium-based browsers in a client application to use AppRTC online demo without any webbrowser installed.
More info about CEF4Delphi: https://github.com/salvadordf/CEF4Delphi