Jetson Xavier AGX [ WARN:0] global /home/lijinzhe/opencv/opencv-4.1.1/modules/videoio/src/cap_gstreamer.cpp (933) open OpenCV | GStreamer warning: Cannot query video position: status=0, value=-1, duration=-1
[ WARN:0] global /home/lijinzhe/opencv/opencv-4.1.1/modules/videoio/src/cap_gstreamer.cpp (1757) handleMessage OpenCV | GStreamer warning: Embedded video playback halted; module v4l2src0 reported: Internal data stream error.
[ WARN:0] global /home/lijinzhe/opencv/opencv-4.1.1/modules/videoio/src/cap_gstreamer.cpp (515) startPipeline OpenCV | GStreamer warning: unable to start pipeline 问题)

Jetson Xavier，AGX 罗技C930C摄像头，opencv4.1， tensorflow2.4，JetPack4.5
首先可以查看一下摄像头是否在位，命令行输入

ls /dev/video*

我的虽然是外部的摄像头，但是显示的是video1

而其实问题并没有那么复杂，只是因为你的帧率设置的太高了而已，把它改为

capture.set(cv.CAP_PROP_FPS, 30)

或者更低的帧率即可