They're probably using the HDMI/analog video output of the camera, like some streamers do, and broadcasting that video, maybe using analog transmission on the c

They're probably using the HDMI/analog video output of the camera, like some streamers do, and broadcasting that video, maybe using analog transmission on the clear. Or they could put in a Raspberry Pi-esque computer in there and have a WiFi antenna. There are aftermarket reversing cameras that are wireless that I imagine could be repurposed for the transmission: https://www.youtube.com/watch?v=Fen3nwtllEU https://www.youtube.com/watch?v=Fen3nwtllEU , although the quality would be lower that using a Canon DSLR doesn't make sense.