Hello,
I can develop the python application to move mp4 files from Hikvision IP cameras to Raspberry Pi local storage (SD card). I have my own Raspberry Pi boards (1b, 2b, 3b, 3b+, 4b-4gb). I also using Hikvision NVR (DS-7608NI-E2) and Hikvision IP camera (DS-2CD1021-I and DS-2CD1121-I). But these cameras don't have SD card slot. I need more details about your Hikvision camera model.
Let me know if you interested
Regards