Almost any security camera will work with a slingbox. Just make sure the security camera has a composite output. This is typically in the form of an rca style yellow output cable connection. It could also be in the form of a bnc connection which can be converted to a composite rca connector with a simple adapter which you can find at a variety of places, including your local radioshack.
Simply place the security camera where you want it, run power to it's supplied power transformer and connect the video output cable (some also incoporate sound as well) to your slingbox's a/v composite input. Setup the composite source input using the slingbox setup assistant/wizard and you should be good to go.