Your mac is saying that VDMX has access to the camera at any moment once the application is open. If you noticed. The first time you use the FaceTime Camera in VDMX there’s a delay (about a second or two). VDMX keeps the camera running to avoid delays (since this is for live performance, most users want as little latency as possible when switching to camera feeds).
If you uncheck the camera in the VID In menu, it will turn off:
There is no discord server and for a number of reasons that have been discussed: