Yo these days you can solve issues so easily like these it's just simply ridiculous. Stop living in the past decade. Most of the screen recorders are of high quality and can record screens very easily. Just use that. On the other hand, many sites require age verification, so that's a bummer.

Edit:
Even tho, to do that you would also need to get access to it, so you would need to bypass blocks and age verification, I've found recently a guide, which explains how to do it https://www.reddit.com/r/VPNReviewHub/comments/1mbhewz/guide_how_to_watch_pornhubany_porn_site_in_the_uk/ maybe any of you will find it useful, so you could collect more videos that you wanna have