Users of Photodermatosis are banned by flash and may be unable to use any other content at all, so this is forbidden. Since you need to pay attention even in the screen as well as in the movie, please play the movie and check it. For a more detailed definition of flashes, see Understanding Success Criterion 2.3.1.
|Principle||Operable||User interface components and navigation must be operable.|
|Guideline||Seizures||Do not design content in a way that is known to cause seizures.|
|Criterion||Three Flashes or Below Threshold
|The webpage has no flashing more than three times in any one second, or the flash is below the general flash threshold and the red flash threshold.|