To delete a video
From the Home screen, tap the Apps Key
> Gallery 
, then tap an album.While viewing an album, tap the Delete icon
at the top
right corner of the screen.Tap to checkmark the video(s) you want to delete.
Tap Delete at the bottom of the screen.
Tap Yes to confirm.
NOTE
Touch and hold a video file to delete a single video. Tap Delete, then tap Yes to confirm.