Navigation/Rear Camera Quesiton

[Sneakygoat]

Hoping I don't get flamed for an existing thread. I searched but couldn't come up with an answer to my question.

I am in the market for a Z right now and leaning towards a Touring with Sport Package. I will more than likely buy a slightly used one unless I can get a great deal on a new one.

My question is do the 2010's and up that have the navigation built in automatically come with a back up camera? If not, can you integrate an aftermarket camera into the factory navigation system?

I have considered putting in an aftermarket system to a Z without the factory nav package as I worked at an aftermarket A/V auto shop for about ten years. I just really like how clean the factory navigation package looks and am not a huge fan of the compartment sans the navigation. I really don't feel like fabricating something in the compartment either.

Thanks in advance for any information on the topic (including links to previous threads I may have missed)