dont let the DD-WRT thing scare you off.. it looks harder than it is.
Download factory-to-ddwrt.img above and save it.
Login to router, Reset it to Factory Defaults.
Connect and log back into router after its all on default values.
Go to Advanced -> Firmware -> Upgrade (or something like that), choose the factory-to-ddwrt.bin file and upgrade it.
Let it do its thing, DO NOT UNPLUG OR INTERFERE WITH IT.
It should come back online w/default DD-WRT firmware when its all done.
Then you can start setting up the router again for your network (Wifi, DHCP, etc).. when your happy that everything is working again, start setting up OpenVPN with the doc above.
Thanks nayer. I will look at it more when I get home.. My end goal then is to have only the cameras on vpn?