How to make a strobe-like effect on my videos?

Hey guys, I'm kind of a noob at iMovie, but I'm putting a guitar cover on youtube, and want to put somekind of strobe effect on it, whether it be with brightness or colors. Think of it like the video of me playing, and the strobe on top of it. Is there anyone who could help me achieve this? Thanks!

The way to do this is to use a fast fade through white transition between clips.
For example see [this video by Mads Dreier|http://www.youtube.com/watch?v=dO0D0lVzYro]

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