Questiok on editing videos for iPhone 5?

How do you take cropped pictures and insert them onto a video for the iPhone 5? Is there like an app for it? Trying to get them on my vine.

UPDATE: the way the face is cropped onto the poster where the Krabby patty is supposed to actually be is what I'm trying to find out how to do stuff like that

https://vine.co/v/MLUh6n6udD6

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