Maybe include a link to the video to give an idea?
Come to think of it, sounds like an item that’s not common & may not be cost effective. However, people have been using PET plastic in place of traditional skins for awhile, check out this video?https://cigarboxnation.com/video/demo-and-talking-about-my-travel-uke
That looked like book covering clear contact with fibre reinforcement in it. Plain stuff can be got anywhere but I haven't seen the fibre reinforced stuff myself. I have seen it in packing tape.
As you can see me in the other video demonstrating my travel uke I use the heat shrunk PET bottles quite frequently and they work great.
That seems to be book binding tape, good luck finding that, I haven’t seen any for decades. That’s kinda obsolete compared to the way we bind our books here these days? I thought it was funny how he secured it with super glue, I’ve never got anything on an instrument to stick with super glue :) Something I learned about skinned instruments is there’s no substitute for the real thing. So if you know a drummer, broken drum heads are like gold, you can make your own custom skins from the good parts of them?
After watching the video a few times, the finished product doesn’t seem to be very musical, the string was pretty floppy & toneless & I think it’s because that plastic material will buckle under normal pressure. so you really can’t tune it all the way up to pitch? I think a real skin or drum skin is your best bet?
real skins are ez to find & can be quite economical, but ya gotta do a little digging to find them tho. https://www.etsy.com/listing/678416303/goat-rawhide-skins-unbleache...