The folks at Production IG have released yet another sci-fi app in the form of the Ghost in the Shell: Optical Camouflage Camera. This one allows you to snap pictures or capture video that turns transparent against the background, as the characters did in the original GITS movie. To make it even tastier, they are throwing in free backgrounds from the GITS: SSS movie for you to position your people and objects in front of, to maximize the fun. It is currently on sale for $1.99 during the roll-out period, but expect the price to go up after a bit. While you are in there, you might want to grab their previous two apps which are running at 99 cents each. The first is the Character Music Player from Ghost In The Shell: S.A.C. Section9, the second is the 3D Cyber Clock. While I like all of these apps, only the first allows you to create your own original video.
The other app worth mentioning is FiLMiC Pro, which gives you a bunch of functionality for enhancing your HD video capture. It is a bit pricy at $2.99 compared to most other apps (or at least most I find interesting), so check out the new stuff it gives you before making your decision. *grin*