can a dvd player in fit in the ashtray of a 05 sts

i was wondering if a mobile dvd player, preferably one with a 3 inch screen, or motorized screen 6-8 inches can fit in an ash tray of 05 sts. my car has the stock cadillac navigational system. but i am looking to have a rear seat entertainment system for my car, by adding tvs in the headrest. but the stock navigation system doesnt have a real video out. so i need to add another dvd player some where in the front that i can control and see what i am control hence the need of a screen on it. just lookin for some feedback or help. i recall seeing someone on cardomain with a cts do what i was talkin about, but there are way too many cts to look through.