Looks like compression artifacts to me. Could also be a function of the high frame rate.
My daughter shot an entire web series on a T4i that had the clarity of a much more expensive camera, so I know it can be done. Shoot largest possible format, 24fps, 1/50th for your shutter speed. Export at maximum size / least compression. A 20 minute video could end up being 1-2 GB, but you can just upload to YouTube overnight.
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