If you have one of those 30pin to RCA stereo & composite video cables. Will the iPod app output a video image of the current song album art, or will the app only do video out for actually watching videos?

I've got an interface I was going to install that makes me be able to control my iPod playback on my iPhone using my car's native stereo controls (it is done using the CD Changer port on the cars stereo). But my car also has RCA input jacks for composite video and audio. I love the MotionX GPS app and think it would be cool to see the GPS screen on my iPhone on my car's screen. So I was thinking of just using the RCA jacks combined with an RF or bluetooth remote control. But if I can't see any song information via the composite video out, then forget it.