I made something like this for my wife with clojure and clojurescript. Basically it used websockets to broadcast a url to the clients and the client displayed t

I made something like this for my wife with clojure and clojurescript. Basically it used websockets to broadcast a url to the clients and the client displayed the image at the url with some css decoration. She was doing phone conferencing for audio at the time. Worked really well for its purpose and was super simple. She has since moved to zoom and just does plain screen shares now.