If it will take a series of bbcode links, this is a bit long - (Sorry).
For many years I have used xwinwrap to play video and GIF files as Desktop Wallpaper, and wrote a number of small scripts to do that, with a simple Zenity interface to select them. Someone 'acquired' one that I shared and published it on Git Hub under his name, so I stopped sharing the newer ones. (I quite like people enjoying my scripts - but it is a bit mean to publish them as work under their own name).
For a long time I also wondered if there was a simple way to get Linux to play Live Stream web videos as Desktop Wallpaper.
I read various ways, including installing special programs - most of which I tried and could not get to work. But I knew it must easierwith a bit of thought. I'll enjoy this until Wayland buries it
Here's the result at this morning using my Mint 21.2 KDE OS running on an i5 6400T processor:
Oooops - I should have shown the Mint KDE Desktop . .
And the Zenity GUI . .
Now the clocks are out of order, but the general ide is there.
The video plays LIVE behind everything else on teh Desktop until I click the RED X on the right panel.
The left and right Panels were originally there to give me a clear spot at the side of any Maximized windows to be able to quickly scroll.
However I use a lot of scripts and Apps on a frequent basis, so the Panels do double duty as Quick Access to scripts I have written (like the Orange and Red ones on the left that quickly start and stop Desktop Record Screen, rather than opening an app.
At the bottom is a Cairo-Dock that I use for the same sort of thing. It hides when I Maximize a window - until I move the mouse to the bottom.
One more showing that it is in fact Wallpaper - behind APPS:
It all looks cluttered - but is very functional, and because my monitor is a 55 inch screen - it isn't near as bad as it would be on a small screen.
Ok, again, sorry for the huge post - and a Merry Christmas to all who celebrate the season !