Whatever has led you to this, I am sorry. But we will be here for you in whatever you choose.
Just my thoughts on the other...
Video? I view the point of a ctb to be a personal, without chance for others to use it for their own 'pleasure'. You must have suffered in life, no sense in letting others use you after you die. Your decision of course.
But just as others have said, there's basically no place you could post it without it being removed, except places where people would 'enjoy' it in ways you probably wouldn't want. Not to mention, you wouldn't be able to post anything, it'd be up to whoever finds the recording to do as even a livestream can be flagged/removed/stopped/etc. and they have been just because of trolls reporting ones that weren't even bad.
And legality? Not a lawyer, but laws in different places may make it illegal too. But again, wouldn't really matter when you aren't around anymore.
Personally, I'd just let my last moments be for me, and just me--well post so people know why I disappeared, but still that's a "for me" thing.
But again, what you do is your choice, even with a video-- just a heads up that it probably won't be around long if at all, or be put on a site you don't really want it up on.