obs-studio : Software for Recording and Streaming Live Video Content ( https://obsproject.com )
v4l2loopback : v4l2 loopback device which output is it's own input ( https://github.com/umlaeute/v4l2loopback )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a dev1990-overlay
For Paludis use this rsync : rsync://gentoo.zugaina.org/dev1990-overlay-portage
If you have a problem : ycarus(-at-)zugaina.org