Want to add a Picture onto a Video, iMovie

[esadb]

So i found this video here http://www.youtube.com/watch?v=xOqx7HCwZI8

Its one where a person places Chuck Norris' picture besides an iPhone 4 and the signal goes up, and when its removed it goes down.

What id like to do is as the person slides that picture into the video i would want to put a picture a friend of mine so it looks like its his picture. Now this doesnt have to be perfect by any means but just basically cover Chuck Norris' picture.

I tried playing around in iMovie but i couldnt figure out how to do it or if its even possible to do?

Could someone person help me out?

 

[BitterB]

Use transparent background image

Esadb,

You can create this effect by taking your friend's image, placing it on a transparent backdrop, then importing your new image into a picture in picture window for insert into your movie. I have accomplished this in similar fashion for arrows and circles I have placed as overlays on top of video.

You will need a picture type program (photoshop or pixelmator) to clean up the background of you friend's picture, change it to transparent, and save it as a .png file. This is then the picture you can insert into the picture-in-picture frame within iMovie.

Good luck.