@jatheesh81 if you have new Hikvision NVR then you don't need static IP.
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Simply enable "platform access" and then download hik connect app on your phone where you can scan the QR code from you NVR platform access setting. That's it.
Platform access works even if your behind CG-NAT, basically it route you through "dev.sgp.hik-connect.com".
Edited: static IP and port forwarding is only need for DVR/NVR who don't have platform access. I have a old DVR for which I need static IP and need to manually port forward in
router settings. And for my other new NVR with platform access, it works with static IP or port forwarding.