If the Kizashi had the factory navigation unit, it would have the Suzuki 2-DIN mount hardware. I believe that factory trim kit is around $100. An aftermarket 2-din trim kit from Scosche (part# SI2229B ) is more like $20, and includes a filler you could use if you wanted to put in a 1-din unit for some reason. You can use any aftermarket 2-din size unit of your choosing, but will need to adapt/modify the wiring and (most likely) add a decoder box for the steering wheel controls if you wish to keep them. The radio wiring will differ, depending on if you currently have the Rockford Fosgate sound system or not.
There is a small plastic filler on the trunk lid near the license plate intended for the factory backup camera (found on the SLS models), however I believe you will need to run your own wiring in the trunk for power, and run a wire for the video signal up to the front of the car. I know a few people here have added them, so a search thorough the forum should lead you to some examples and instructions on how you might do that.