If you are doing it because you're a creator on YouTube and you are getting paid through views on YouTube, aren't you then required to get release info? If it's for personal use, sure thing, but when you are making money on it then you should absolutely get releases and default to bluring non-released individuals.
I think the bigger issue is that our laws (in the US at least) haven't really caught up with this gig/creator economy. It would be no different than a blockbuster film group filming a war/battle sequence and having to get permission ahead of time from the location and individuals.
My work will have signs up or ask explicitly if they are filming and intend to publish. If you go to a private org with the intention of filming, you should follow the same rules for a full-budget production group.