A nice video. A pleasure to sit and watch whilst it's cold and wet outside. Too early for swarms here but this gives me the itch.
Different folks ...... different ways. I would have put the swarm box with one or two frames of comb, no floor, a closed top, on the roof hanging over the swarm. Gently smoking from below would have encouraged the bees to walk up into the box ..... in theory

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"There is more than one way to skin a cat."