Cam is very good and you don't have to use the micro. With any good recording tool you can choose which micro to use. I use OBS - Open Broadcaster Software.

Is this webcam compatible with Windows Hello, i.e. can it be used to log in with facial recognition?

I want to start streaming on twitch. Does anyone know if I can connect the webcam to the ps4?

You want to do LetsPlays and you don't know something like that? :D