Gstreamer Nvv4l2h264enc: Cannot identify device '/dev/v4l2-nvenc'

Hi,
This is expected since there is no hardware encoder in Orin Nano. Please refer to module data sheet for supported hardware functions:
https://developer.nvidia.com/downloads/assetsembeddedsecurejetsonorinnanodocsjetsonorinnanods-11105-001v02pdf