The Nikon ES-2 Film Digitizing Adapter was announced way back in August 2017, along with the Nikon D850. It looks like somebody finally bought the $140 plastic tube, though, because a sort-of review and how-to has been posted to DPReview.
The D850 came with a feature specifically designed for use with the ES-2, and so does the new Nikon D780, which is what’s used in the video. Although you don’t have to use one of these two cameras. You can use it with any camera, as long as you have a macro lens.