Have your son take a look at some of the Sabre Effects apps for the computer (Mac and PC) or iPad to see if he's interested in adding some effects to the video. They can be a little time consuming but I think he would really enjoy the results.
I did this short one for my sons 10 years ago and they got a kick out of it.
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My kids made a few Zelda movies when they were young and to this day they are a highlight of their childhood! That's awesome make sure to keep a copy somewhere.
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