OBS Studio (runs on linux, mac, windows) has the virtual webcam. This allows you to make your video output into a webcam device to hook up to any video softwar

OBS Studio (runs on linux, mac, windows) has the virtual webcam. This allows you to make your video output into a webcam device to hook up to any video software. Then you can do all the normal stuff like in OBS, like putting images on, overlays, animations, screen sharing, movies, etc.