When bees are swarming in the air I have taken two boards and clapped them together. The bees will quickly land somewhere close. I never seen the bees swarm to a box as in video. Bet pheromone was placed on the box.
My reasoning the bees collect after hearing loud BANGS is the bees think thunder and about to rain, thus they quickly gather up on some limb. Now folks, what I stated is a guess: that is a loud sharp noise is related to thunder as the bees see it. I do not know what bees think, but I have seen my bees collect within 60-90 seconds of hearing me bang boards together. Cause and effect may be misinterpreted by me.
I have heard several experienced beeks say to make banging sounds to cause swarming bees to collect, I did it and the swarm of bees collected near by on a limb. Thunder is all I can come up with, if you have a better interpretation I adore learning.
BTW, my first experience at calling Toms was comical, Tom can running through the brush and was within 20 yards of me. The bird took one look and scadadels, I did not even get a chance to raise my gun, that Tom was gone in a heartbeat and left me with a WHATDA????