Action camera connected via two usb extenders and RJ45 doesnt work?
Unfortunately, given the models you mentioned in comments, the purpose of both of your ethernet adapters is to connect usb host devices, like computers, to ethernet network devices, like switches and routers.

There do exist purpose-built USB extenders (see: example NewEgg search), some of which have RJ-45 ports to operate over cat5 or cat6 cables just for availability and cost savings—but sadly, that's not what you have. They're also usually considerably more expensive. And they do not work with ethernet data networks, instead only as a matched pair. I'm afraid you'll need to work up another solution.