Add background video to certain user profiles?

That is incredibly in-depth and I’ll be sure to look it over when I have some time next week, but suffice to say from a skim it seems much better than my current implementation (embed the video on every single page and only show it on the user profile, which I accomplished with a script that adds a tag to the body of a user’s page if their account name is a certain thing). Thanks for the in-depth explainer, can’t wait to get around to it!