Hi, the program (webapp) itself can’t do much, but depending on the operating system, you can share the contents of a window, the screen, or an OpenGL application (like a browser window if you have hardware acceleration enabled) as a camera. I can’t help you further without knowing the operating system you’re running, but some options are ManyCam (Windows, Mac), Webcamoid (Windows, Linux, MacOS) or if you are using Chromium (Chrome, Edge, Vivaldi, Brave, etc.) screen sharing also let you only sharing specific browser tabs, sadly this feature is not available on Firefox