Issue:
GV-DVR/NVR fisheye dewarping cannot use.
Solution:
Change GV-FE camera to single stream only then you can do the dewarping in NVR/DVR.
PS.
1. NVR/DVR does not support PPTZ camera. Please change to use VMS.
2. VMS is possible to add GV-FE camera by Dual Stream.
Reference:
[ UVS - 201908084001 ] NVR v8.8.0.0 cannot use dewarping for PPTZ7300 F/W v1.03