Its hard to tell from the video. Does it have the "pinstripes" yet? It may be changing sex and the pinstripes "may" be coming in?
As long as it eats well, swims normally, and doesn't appear to be ill, I wouldn't worry about it too much.
Do see if you can catch him in one spot and take a close up of it if you can though.
I am lucky to have a pet store that will hold livestock for me. They typically don't, but I told them that I won't buy a leopard wrasse that doesn't eat prepared food, and eat well.