Supporting two video modes

Please check if you can run v4l2-ctl command like:
gst-launch-1.0 capture from 4 cameras simultaneously success, but v4l2-ctl failed - #5 by zmaqidong

Usually if v4l2-ctl command works and format, width, height, framerate is set exactly in gstreamer pipeline, it should run fine. We have the steps in
Jetson Nano FAQ
Q: I have a USB camera. How can I launch it on Jetson Nano?

The v4l2src plugin is a native gstreamer plugin and generally we try with integer framerate. Don’t have much experience in running framerate like framerate=30000/1001. Per your comment this case should work fine, my apology we don’t give precise information about this.