The Magic Lantern (formerly 5D Mark Free) software gets zebra stripes to show overexposed portions of the video. They are not recorded to the quicktime file.
With the announcement from Canon that full manual control is coming, the Magic Lantern project can start focusing on these sort of enhancements, rather than just manual exposure control.
FAQ on the Magic Lantern project: cinema5d.com/viewtopic.php?f=14&t=2494
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