Looks to me that the DVR is 'BNC' and the door cam is 'phono'. Without knowing exact models hard to confirm 100% but a simple BNC plug to phono socket adaptor should work.
https://www.maplin.co.uk/p/bnc-plug-to-phono-socket-adapter-fa11m
Hope this helps. I'm sure the CCTV gurus on here will be...
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