According to TechiSky, even though you hire VLC or Perian or any other media player to take care of your video playback instead of QuickTime, you still need to install QuickTime in order to add video to iTunes 11 for transfer to iPad, iPod, iPhone or Apple TV.

Read more: http://www.techisky.com/news/itunes-11-requires-quicktime-installed-for-add-video-to-itunes-11.html