I got the HDRP demo working -Started a new HDRP project. Dropped in Kejiros files into the Assets folder. Changed the manifest.json file as instructed on his git repo. I found had to tweak the file path the to video Test.mov (I’m on Windows) and set it to local filesystem with an absolute path to the video. I then clicked selected the Vfx object, then on Asset Template, clicked Edit and it worked.
Been tinkering with the Vfx, but would love to get this working with the URP as @AndrewWhitney has done with native Depthkit clips as done here.