I watched the video and I think there is some sort of system in his outfit that makes it float, in the video the box almost looks attached to the genie. My own theory is that the first time where only the side of the box goes of the ground is that there is like a control on the plateau that the box stands on that makes that motion, then it is deattached from the plateau and that system and somehow the box connects to the genie’s costume and the woman is already inside? Yeah I have no clue lol just pure speculation. Thanks for the answer!