CCTV Integration With Eftpos

Hi have a client with multiple sites who wants cctv to monitor them all accessed from Head Office via remote view. So far so good but they also want to integrate the CCTV pictures with the Eftpos system (text overlay) I have looked at this in the past but understood you have problems with the time stamping from the tills and the NVR or DVR moving apart overtime. I normally use Hikvision for the CCTV and I understand the tills Eftpos system is Bepoz.

Any suggestions from people with experience particularly with those brands would be appreciated

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