From an accessibility point of view this can be more than an annoyance. If your video means I can't hear my screen reader, and I'm the sort of user not to plan

From an accessibility point of view this can be more than an annoyance. If your video means I can't hear my screen reader, and I'm the sort of user not to plan for this inevitable sort of event, my computer is unusable until it finishes or until I recover sufficiently from being disoriented to remember the hotkeys to get out of there. So please never do this again. Thx.