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For a school project;

How could I add a face to a bowl like in this video?
http://youtu.be/hEgCa06uQAY

is it possible in iMovie?
should I make, say an animated gift of the face in illustrator, and then add it on top of the video?

iMovie is not the right tool for doing this kind of work. You need to look at Apple's Motion. It allows you to create video like this.
 
For a school project;

How could I add a face to a bowl like in this video?
http://youtu.be/hEgCa06uQAY

is it possible in iMovie?
should I make, say an animated gift of the face in illustrator, and then add it on top of the video?

After effects would be the easiest program. Create the shapes and track the motion. Very simple. You can download a free 30 day trial which is fully functional
 
boch82, thank you for your time I will use the trial.
careypo, I didn't know about it. Thanks for helping me, I'm usualy good at googling but this time was hard
 
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