Japanese porn is being "decensored" with AI as we speak, in fact. It looks a tad uncanny, still, but finding a "decensored" clip in the wild was quite the thing for me a couple of weeks ago.
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Not to mention deeply and disturbingly unethical
If it is against the wishes of the people in the video, yes, yes it is.
E: Never thought I'd see the day I'm downvoted for saying un-blurring porn of people who made porn under the assumption that it would be blurred (and may not have made that same decision without that context) is unethical, on HN of all places, but times are strange I guess.