I have recently started using Vitamin D Video, and I am very impressed! Thank you for sharing it!
I have one suggestion for an improvement: make the permanent deletion of video run as a background thread. It takes a long time to delete a large amount of video, and I cannot use the application until it has completed.
In the UI, you could add the videos that were selected for deletion to a persistent list, then instantly hide them from the user. Then, a background thread could work away at physically deleting the videos. If the user quits the application before the background thread has deleted all of the videos on the list, the application could continue deleting from where it stopped, the next time it is started.
