The simplest way to get video in your auto would be to put in a DVD receiver in your dashboard. These stereos feature huge touchscreen screens for your video playback in addition to offering several features such as Bluetooth, Pandora control, Back-up Camera, Mobile Phone Connectivity, Satellite Radio, Auxiliary inputs & more, all in a easy to use touchscreen radio.
Also, some receivers with multi-zone capacity have sound/video outputs for rear entertainment systems. When you engage the dual-zone feature, you can send the signal from one source, like a DVD player or video game console, to the rear monitors and their headphone transmitters; the folks in back will be able to enjoy that source. The beauty of car video is that there is no shortage of options, but the key to having a satisfying system is having a clear vision of what you want.