The ‘set video transparency’ block automatically turns on the video (acts as though it has a 'turn video [on]' block appended to it).

Also, if the video is [on-flipped], then ‘set video transparency’ turns it to not flipped.

And if 'video [motion] on [stage]' or 'video [direction] on [stage]' appear on stage then the video camera automatically turns on.

I wonder, could the unused Motion blocks section for the stage be re-purposed for Video blocks?