The 12 volt to USB was just one I had laying around the parts box.
The camera was from http://www.element14.com/community/groups/raspberry-pi-accessories
The 64 GB card was bought at Costco.
The instructions that I leveraged were from the installation instructions for the pi camera at http://www.element14.com/community/docs/DOC-54359?ICID=rasp-accessory-group
I added a few scripts to manage the startup and storage of the video. When the unit powers up (when I start the car) it starts. When I shut the car down I press a button before shutting the car down that stops the recording and stores the video file and shutdowns the pi.
Each time I run this in the car I have to park the car in the garage and transfer via wifi and ssh the video files.
Its a hack at this point, but some of the video management stuff can be made better. The pi camera doesn't like the dark, but there are ways to make the pi camera IR sensitive by doing a little bit of surgery to remove the IR filter. I haven't tried it yet, but I'm sure that several others may be offering this version of the camera soon.
Hope this helps,
I mounted the camera in front of the rear view mirror. The pi was in the overhead console with a 12 volt to USB converter supplying power from the overhead light. 64GB SD card allows for a lot of video to be stored. Cost less than $100.
I'm sure there are cheaper ways, but this is what I had available.