What you'll want to do is setup a wifi sta mode connection, and associate that with a new network interface. See this article:
I'd recommend associating that new network interface with the lan firewall zone.
From there, you should theoretically be able to connect to the camera by its IP address. It is possible that it will not work, though, if the camera doesn't accept connections from a different subnet.
You should also check out the Travelmate package that willg racefully handle the situation where the camera's wifi is not available.