It's more than likely not in the vehicle. The vehicle's wiring harnesses are built (by hand) in various configurations depending on options in the car. For something like rear view camera it won't be there because it requires connections to 12V power, FlexRay/CAN bus, CIC head unit, the camera control module, and the camera itself. The latter 2 items won't be in the car.
These cars aren't like older generation vehicles where the car was pre-wired (and had the labels on the trunklid indicating so.)
2015 X5 M - Donington Grey/Mugello Red - Lots of mods
Past: Bimmerpost Featured
2014 X5 xDrive50i · 2014 Jeep SRT · 2013 Tesla Model S P85+ · Bimmerpost Featured
2013 F10 M5 · 2012 550 xDrive · 2011 M3 ZCP