hello hardik3,
please see-also Camera Architecture Stack, you cannot using v4l2src to fetch the camera stream since IMX219 it’s a bayer camera sensor.
please check sysnode, is /dev/video* has created successfully?
please also check kernel init messages, $ dmesg | grep 219, is there any failures related to sensor registration?
furthermore,
you may have a try to execute Jetson-IO to re-configure the CSI channel to enable IMX219 camera support.
$ sudo /opt/nvidia/jetson-io/jetson-io.py
-> Configure Jetson 24pin CSI Connector
-> Configure for compatible hardware
-> Camera IMX219 Dual
-> Save pin changes
-> Save and reboot to reconfigure pins