Just for my own curiosity....are you trying to get it to play videos for kids riding in the back seat?
Otherwise, I can't imagine why a person would even bother trying. Maybe it's just one of those, "it says I can do it, so I'm going to check it out" and I can understand that, but when would you ever sit in your truck and watch a movie?
Waiting for the spouse in the shopping center parking lot? Stuck on a ferry? Double-booked in the living room?
Personally I sometimes enjoy quiet, relaxing moments without any distractions. It's when I get some of my most dangerous thinking done!