I was playing around in the diagnostics screen in my NAV system and there is a grayed out button that says DVD player......
Is that that an option I did not get, or is it another one of those "not for USA customer" blocks
does anyone have this option enable on there Camry

Since there is only one DVD player in the car and that has the NAV DVD in it maybe you should try replacing the NAV DVD with a Movie DVD and see if it works.

There are 2 dvd players and neither of them play on the NAV screen..
I was just wondering if there was a way to enable the input, there is also a camera
button blanked out....BTW when I put a dvd in the map slot it says "no map disc" and won't let me do anything....

On mine there is one DVD player and a one 4 CD changer which won't accept DVDs.

I think our Navigation unit has AV inputs in the back for camera and possibly for DVD player, those menu options are probably for those untits equiped with those extras. If the equipment is not hooked up, the menu items are properly greyed out. I think Sienna is one of the cars using the same NAV system and has factory options for back up camera and DVD player.