Find a location where a lot of activity is taking place. With a partner, shoot 9 minutes of video with the camera locked off on a tripod and all settings set to manual. Import into FCP and cut the clip into 9 minute long sub-clips. Crop each sub-clip so that a unique 1/3 by 1/3 tile is remaining. Stack the clips and edit to 20 seconds. Export as a Quicktime movie.
Mosaic Video Tutorial