I have a 2014 Ford Fusion Titanium, which comes with not only a rear backup camera but also a front camera that's used for the lane departure warning system. Has anyone attempted to utilize these cameras as dash cams coupled with some kind of DVR?
Those OEM backup/front cams are most likely analog and not even HD, or will not even have WDR (night vision). So, starting from that you don't have much to work with. The next challenge is they probably are all connected via the complex CANbus which will be extremely difficult to tap into assuming it's an analog a/d signal. I'm not sure this project is worth the effort unless you are in a major DIY project mood. You're going to have to dig deeper to get the exact specs of the camera, sensor, and the type + method of signal it transmits.
Analog? I doubt it. Probably digital, but maybe not HD resolution. The CAN-bus is digital, and almost everything else related to communication in a car. So why using a old analog camera & having a need for a A/D-converter? Don't think so.
Even if the factory cameras are analog, there is a problem of recording that analog signal. There are analog to digital storage devices available on ebay, but there is no data about video encoding used - most likely they have very poor video compression.
Therefore, it would be nice to have DVR that would have video input. I haven't seen such DVR yet.