Can be done but the kit from Kufatec is pretty expensive (500£).Then needs coding with VCDS.
to enable cam just code:10 Einparkhilfe Byte 02, set Bit 4 to 15F Informationselektr. Byte 19, set Bit 4 to 1
Wiring is usually down the right hand side of the car when looking at the car from behind (drivers side in other words)
You may need to look then but to be honest what's the difference between behind the head unit or in the glovebox, about three inches??