CMOS Camera Connection to FPGA (DE2 Board)

Just because the camera has an RJ45 connector doesn't mean it can do Ethernet.

You can wire all sorts of Interfaces to RJ45, e.g. serial Uart is very common.

As the camera seems to come with some dedicated capture board, and receives it's power via the RJ45, I would assume they are using a non-standard implementation. Your best bet is to build an adapter to split power supply and data.

At first I would look at the datasheet of camera and DE2 board to determine wether an interface matches regarding function (e.g. Ethernet, serial, ...) and voltage level (in case of serial).

Second, if you really want to do ethernet, look for the Triple-Speed-Ethernet (TSE) IP-Core and Nichestack examples. These are not for free, but you can try them out and the examples tend to work.