They look to be mites, but I have no idea what kind they are, or whether they might be bad or good guys from the videos. Do you have any fungus gnats by any chance? My own soil is undergoing an explosion in the springtail population right now, and I know within a few weeks that will be followed by an increase in Stratiolaelaps (Hypoaspis) mites who eat their larvae. I tend to take the lazy attitude that if my plant isn't hurting and I see bugs, then I leave things alone (as long as they can't fly). But in my growing style those bugs play an important part of nutrient recycling, as well as protect my grow from pests like gnats or thrips.
With an infestation as bad as shown in your videos, if they were bad guys I'd assume your plant would be showing negative signs by that point.
