I fitted my very own reverse cam into my VW badge on my MK5. It was from something like reversecameras.co.uk and was only about £50. I still have the camera somewhere.
Anyway - even in a pitch black night, the camera gave a reasonable display on the screen. Obviously daylight or a lit street was much better, but a dark car park was no problem.
I hope the factory VW camera is as good as my home made one!