Reversing camera

Just a quick question for the knowledgeable…
my gf has a 2009 B8 Q5 and would love to have a reversing camera like mine and I was wondering what is required other than the camera of course… could I be lucky and just have to add the camera or do I need the additional unit etc?
Any help would be greatly appreciated.
Thanks in advance

I would imagine that in addition to the camera you would need the camera interface module and then would need to recode the car (Vagcom or similar) for the camera.

This is what I was thinking but I’ve seen a video where someone installed a reversing camera and programmed it in…not sure if it had Nav or not though?