What is good software for camera recording under Linux?
I was going to recommend Kino which is the one I used when I needed to do that, but according to their web page the project is no longer mantained, so you can either use it the way it is or try the other software that is recommended on their web page:

Shotcut, Kdenlive, Flowblade, OpenShot, PiTiVi, LiVES, and LightWorks.