I have a 16 channel DS-7316HQHI-SH that is maxed out with 16 analog hikvision cameras. I need to add 4 ip cams with the ability to add more in the future. If possible I would like to integrate them together. But if not, then use the old cams with a new hybrid NVR/DVR. What options are there with the unavailability of Hikvision products, to do a crossover/hybrid system?