We've been doing POS integration for years, and from the beginning of transformation from analog to IP, our POS has followed right along. Simple video overlay (analog or IP cameras) and database capture, and includes most c-store applications. The only thing you need to do is provide RS-232 inputs into the PC based DVR/NVR - (simple USB to RS-232, no black boxes). You can check it out at http://www.digi-it.com/product/sub45.htm.