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P.S.: especially in the middle of the video, where the hen don't want to mate, it easily looks like fighting.

Young roos are a bit awkward and if you keep roos together (especially the ones, which just gain maturity) they also mate males. This often leads to real fighting. But maybe what you saw was mating. This is not a video from me, just as example.

Aspecially if males were kept a while alone, they will "rape" fresh females like insane, as far as I experienced. Best results to socialize new birds to an older flock is to place them in sight and hear reach for 7 to 10 days before putting them together. And of course they should be mature...