You can put filters on pretty much any photo, but the choices are a lot smaller when it comes to video. Cinamatic can help
Video editing can chew up a lot of time, but the MatchCut app helps to streamline the process.
StillShot lets you pull full resolution still photos from video files on your iDevice.
The Game Your Video app simplifies video editing, letting you convert plain videos to entertaining ones, using motion effects, filters and audio transformations.