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.)