Hi,
Please share the print before and after the customization for reference:
$ gst-launch-1.0 nvarguscamerasrc ! 'video/x-raw(memory:NVMM),format=NV12,width=4000,height=3000,framerate=25/1' ! fpsdisplaysink text-overlay=0 video-sink=fakesink sync=0 -v
And make sure you run VIC engine at max frequency(disable DFS).