Hi Sir,
I have gone through your requirement and we can make a cloud server for video streaming for your cctv application. But the major part relies in the DVR/NVR hardware which should me hardcoded into pinging a data to a particular server with a unique ID.
If the hardware doesn't support online transmission that cannot be achived, only ONVIF video mode can only be made in most items expect the branded one
Kindly ping me with the more details about the server so we can discuss on scope
Thanks and Regards,
Titan TK