Sorry about that. It's probably that I'm not being clear about what I'm trying to do. What I'm trying to do is a setup a VM (which I already have running) so that a group of mine can work on a computer vision project on one machine. I want to allow each user who accesses the VM, via X2Go, to be able to execute programs on the VM that require their computer's webcam, or USB webcam. Thus the VM has to be able to have access to the client machine's webcam. However, after looking at the instructions for Proxmox VM USB physical port fowarding, it seemed this was only possible if the USB device was connected to the Proxmox server and not to a client viewing the VM over X2Go.
Thank you again. I really appreciate your help.