From the video transmitter that is inside the race car, is there some type of receiver on the computer that is connected to the headset? The video stream that the computer is receiving would need to look like a USB webcam to Unity.
This seems like a difficult application. I don’t know much about streaming videos between two computers, but, you’d need to verify that the receiving computer an take an incoming signal and then make it appear like a normal webcam.
You’d need to run through a script and verify that the stream is detected as a camera.
There may be other techniques to stream to a headset that I’m not aware of.