You're gonna have to use an animated GIF (What I am using). My concept was pretty easy, so I did it myself. taking something from a video may be considerably harder. I'd search the net for some good programs to capture video still shots and then a program to create the animated gif out of those pictures.
You may even be able to find something that will turn a video into an animated GIF.
...Or you may get really lucky and someone on here will do it for you. I'd help, but my schedule doesn't allow me much free time anymore.
EDIT: BrutusMaximus beat me to it.