Dang you Google, why couldn't you allow video when the car was in park? Is this a limitation of your AA API? It it cause the auto makers don't all consistently report the shifter position? Even if that's the case, just notify the user that "your car sucks cause it doesn't report that you're in Park" and let other cars that properly report the position enjoy youtube bliss during lunch.
On a side note, this is awesome. Sure hoping it makes it to the official Play Store one day.