It generally means that there is a virtual webcam device and you have to find that virtual device and point your app to it.
Certain logitech webcam drivers/apps (like logitech capture) act as virtual webcam device and you have to point your app to the logitech capture as the webcam.
If you look at a bunch of youtube tutorials on something like how to use obs --- some youtubers would point the obs software to the actual logitech webcam, other youtubers would point the obs software to logitech capture.