I don't have the most experience, and the video is not ideal, as you mentioned...
I have seen my hives look like that and it is NOT robbing.
I have become convinced that my weakest hive is being robbed. How? A lot more traffic than normal. Bees coming into the landing area, in a circular, buzzing, pattern. Bees in the limited opening, fighting with each other.
So, again, based on my newbie experience, what I would suggest is limiting the opening of your hive to something much smaller, and then observe for these things that I have mentioned.
I think Michael Bush has said that a good way to being able to tell if your hive is being robbed is to put up a robber screen, and see if robbers arrive and are trying to get in.
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