Very strange thing. One video output cycled the cameras. The other one showed all cameras simultaneously. But I couldn't choose any single one.
Anyway,
I followed the guides, but the installer did change every password. Admin / admin didn't work. So I disassembled the unit, found the "reset" jumper (in a different position than what the guide said, but then again, it was a different unit). Everything was fine afterwards!
I connected my PC, searched for the video, and I did hit paydirt - the car of the burglars, the time they did it, how they broke in, and how they tried to remove the cameras. Interestingly enough, when they were removing the camera, it fell on one of the burglars' faces, so we got an amazing close up.
I cannot thank you enough for your help. Seriously.