I was really hoping BlackBerry would bake this into the OS but for now we have Video Shrinker. Right now your BlackBerry 10 device takes video up to 1080p which leaves you with some huge videos. If you want to share them over BBM you are limited to 6MB which is like 1-2 seconds of 1080p video. BlackBerry’s video editor lets you do practically everything to videos EXCEPT for transcoding them to a smaller size.
Video Shrinker is a $1.99 premium app (the payment is in app) that shrinks your videos down to a size that makes sense. This is from the same developer as SuperTube so it has some nice quality to it.