Is it possible to install a dvd player that was meant to be used indoors in a vechicle? If so what would need to be done to do that?

There are some TV/DVD combos that can plug into a power outlet in a car. That might be the easiest way.

You can accomplish this with a power inverter needed because your car uses a 12 volt system. However this seems a waste of time, space and expense when simple 12 volt DVD players are readily available. 8)