Joseph, nothing in the video you linked indicates anything even slightly untraditional happening during selichos. It shows people dancing and singing Rachamono De’onei, which is a 100% traditional and a holy Jewish minhag, after selichos. I do so, my father does so, and my zeideh, elter-zeideh, and elter-elter-zeideh, etc., all did so, and if you have a problem with it then I have no interest in whatever religion such criticism comes from, because as far as I’m concerned it’s not Yiddishkeit.
If you have information that this was going on during the selichos feel free to post it, but until I see evidence I am going to assume you’re just making it up.
Neville, until you can point to something that is objectively contrary to some jewish law, teaching, or value, nobody’s approval is needed. Nobody ever asked a rov whether it was OK to install electricity in his house, or indoor plumbing.