It doesn't work because it is still under construction.
ROS2 Driver for genicam compliant camera
https://github.com/roboception/rc_genicam_api/releases Download the debian package that suits your PC. Install rc_genicam_api.
$ sudo dpkg -i rc-genicam-api_2.4.4-0+20201023+124354.bionic_amd64.deb