I will quickly say I don’t know the answer to your question. However, neither it seems does anyone else who is reading the forum at the moment so I offer this for the sake of discussion... Now here is the question: Does anyone know of a way to connect a backup camera to the Nissan video screen system so I could just look at the video output on the truck and see the front camera? ...
If this were my problem the answer would be to have a separate monitor – that is, a dashcam with camera being remote from the monitor/control unit. This particular camera is not wireless but does come with an 18’ cord. I have this set up with the camera on the rear window of a camper shell and the monitor in the pocket ahead of the gearshift. Works great and I understand there is a waterproof version of the camera.
The big problem for your single purpose is it is an expensive solution, but if you are considering a dashcam at all this format would be ideal.