I have a problem with saying it weights 120 lb when there is no way to ascertain that from that video. No way to know what that is since it's in Arizona and jaguars have occasionally been seen there. But since even a regularly colored jaguar sighting is rare in Arizona the odds of that being a wild black jaguar are incredibly low. If I had to guess, (and that's all anyone can do based on that poor video) I'll say it's a domestic animal of some type. And with nothing near it to gage size it could easily just be a house cat.