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You are using the built-in version of OpenCV. In the case of nvidia systems, the OpenCV version installed by default has not support for GStreamer or FFMpeg, so, you have to compile and install your own version of OpenCV with those capabilities (and dependencies) if you need to open camera streams.

You can use the OpenCV function getBuildInformation() to check if this is your case.

I suggest you to use this blog post for the compilation task: https://www.jetsonhacks.com/2018/11/08/build-opencv-3-4-on-nvidia-jetson-agx-xavier-developer-kit/

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