I wondered, Browsers work really well, are already there anyways, have all the GPU stuff etc already dealt with. They also have portal support so Wayland works great.
It could use the Browsers screencast ability on all platforms, and run with Javascript and WASM.
The stuff could be installed in a local Podman container and thus also work natively on Linux.
Do you know an app that does this, client-side?
Thanks to the actually helpful people:
screenity, GPLv3, has some nice features
recordscreen.io some random webservice, the recording is supposedly done in the browser. Proprietary.
RecordScreen.io works for me when I want to do that. It’s supposed to record locally (I’ve tried and have seen no data leaving my computer, but maybe should try taking it offline while recording, see if it breaks).
Thanks for an actually useful comment :D
It might be something like Photopea, that can also just be downloaded and ran locally.