I don't have BMW Apps, but it seems like they need to be in playlist, not the photo/video library, so have to tried syncing your phone with iTunes, and moving the videos into the "Movies" section of iTunes and see if they show up?
I mean, that is less than optimal, but maybe BMW Apps doesn't support playback from the Photo/Video library of the camera... Just a guess.
2011.5 E92 ///M3 Space Gray; Fox Red & Blk; 6MT; ZCP; ZCV; ZP2; ///M Performance Exhaust (sold)
2012 VW Jetta TDI (sold)
2002 Subaru WRX (sold)
The World in 35mm