If the cameras are connected to a hub you can plug a laptop into the hub and capture in promiscuous mode. This is a screenshot from my network interface settings (the marked driver 'Teledyne DALSA Sapera GigE Vision Filter Driver' is the relevant one). Screenshot of Adapter Configuration (in German, sorry):

Capture Driver: WinPCap v4.1.3 (packet.dll version 4.).Question: Is there any way to prioritize WinPCap, so that it handles the packets before the filter driver? I would like to avoid the need for capturing using additional hardware and prefer a software-only solution to this.

The software which comes with the cameras needs the filter driver to work (there is no plain UDP-Socket fallback) and I would like to analyze it's traffic. The protocol is simple UDP, but for performance reasons (high packet throughput causing CPU load) the manufacturer uses a filter driver that prevents those packets from showing up while capturing with WinPCap/Wireshark.

I've got some GigabitEthernet Vision cameras, which use Ethernet to communicate.

Wireshark usb capture filter windows