You say that like it's a quick install. You have to build it on your machine apparently:
https://github.com/webcamoid/webcamoid/wiki/Raw-build-and-in...
https://github.com/webcamoid/webcamoid/wiki/Raw-build-and-in...
However going to the project website at https://webcamoid.github.io/ it does link to the executables, which is a little clearer.
I guess I've gotten used to going to the Github repo for projects more than most would.