OEM Backup Camera

Ok, I've done a search but can't find what I'm wanting to know.
I have a 06 Canadian model which has everything but the backup cam and GPS.
Now, I've read that some 06 have digital screens and some have analog. I have no idea how you can tell the differance.

Now, what I'm wondering is, can you put a factory cam in the factory OEM spot on the rear hatch.
Also, is the car already wired? I'm thinking it's probably not, but I do know some features in cars are already wired (probably dealer option stuff like fog lights etc.)

I'm thinking it's way to easy to get a cam from a wrecked Prius and just plug it into my car.
I think I've also seen online when you access the cars on screen menu that there is something about the backup cam screen and you can change it to being on or off when in reverse?
I could be wrong on that though.

Any thoughts?

 

Thats only for 06 models right?
Because my Uncle has a 08 with everything but NAV. And he has the backup cam.
Thats the only thing on his car that I don't have on mine.