Not able to read Video from Capture Card with GPU (Unsupported Format) while Reading with CPU works fine

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I am not quite sure how to do that, but I can provide you the Debug Log:

Debug Log 
$ ./run /dev/video0
[DEBUG:0@0.000] global /home/nvidiapc/openCV/opencv/modules/highgui/src/backend.cpp (120) createDefaultUIBackend UI: Initializing backend...
[DEBUG:0@0.000] global /home/nvidiapc/openCV/opencv/modules/highgui/src/registry.impl.hpp (87) UIBackendRegistry UI: Builtin backends(3): GTK(1000); GTK3(990); GTK2(980) + BUILTIN(QT5)
[DEBUG:0@0.000] global /home/nvidiapc/openCV/opencv/modules/highgui/src/registry.impl.hpp (112) UIBackendRegistry UI: Available backends(3): GTK(1000); GTK3(990); GTK2(980) + BUILTIN(QT5)
[ INFO:0@0.000] global /home/nvidiapc/openCV/opencv/modules/highgui/src/registry.impl.hpp (114) UIBackendRegistry UI: Enabled backends(3, sorted by priority): GTK(1000); GTK3(990); GTK2(980) + BUILTIN(QT5)
[DEBUG:0@0.000] global /home/nvidiapc/openCV/opencv/modules/highgui/src/backend.cpp (78) createUIBackend UI: trying backend: GTK (priority=1000)
[DEBUG:0@0.000] global /home/nvidiapc/openCV/opencv/modules/highgui/src/plugin_wrapper.impl.hpp (220) getPluginCandidates UI: GTK plugin's glob is 'libopencv_highgui_gtk*.so', 1 location(s)
[DEBUG:0@0.001] global /home/nvidiapc/openCV/opencv/modules/highgui/src/plugin_wrapper.impl.hpp (230) getPluginCandidates     - /usr/local/lib: 0
[DEBUG:0@0.001] global /home/nvidiapc/openCV/opencv/modules/highgui/src/plugin_wrapper.impl.hpp (234) getPluginCandidates Found 0 plugin(s) for GTK
[DEBUG:0@0.001] global /home/nvidiapc/openCV/opencv/modules/highgui/src/backend.cpp (78) createUIBackend UI: trying backend: GTK3 (priority=990)
[DEBUG:0@0.001] global /home/nvidiapc/openCV/opencv/modules/highgui/src/plugin_wrapper.impl.hpp (220) getPluginCandidates UI: GTK3 plugin's glob is 'libopencv_highgui_gtk3*.so', 1 location(s)
[DEBUG:0@0.001] global /home/nvidiapc/openCV/opencv/modules/highgui/src/plugin_wrapper.impl.hpp (230) getPluginCandidates     - /usr/local/lib: 0
[DEBUG:0@0.001] global /home/nvidiapc/openCV/opencv/modules/highgui/src/plugin_wrapper.impl.hpp (234) getPluginCandidates Found 0 plugin(s) for GTK3
[DEBUG:0@0.001] global /home/nvidiapc/openCV/opencv/modules/highgui/src/backend.cpp (78) createUIBackend UI: trying backend: GTK2 (priority=980)
[DEBUG:0@0.001] global /home/nvidiapc/openCV/opencv/modules/highgui/src/plugin_wrapper.impl.hpp (220) getPluginCandidates UI: GTK2 plugin's glob is 'libopencv_highgui_gtk2*.so', 1 location(s)
[DEBUG:0@0.002] global /home/nvidiapc/openCV/opencv/modules/highgui/src/plugin_wrapper.impl.hpp (230) getPluginCandidates     - /usr/local/lib: 0
[DEBUG:0@0.002] global /home/nvidiapc/openCV/opencv/modules/highgui/src/plugin_wrapper.impl.hpp (234) getPluginCandidates Found 0 plugin(s) for GTK2
[DEBUG:0@0.002] global /home/nvidiapc/openCV/opencv/modules/highgui/src/backend.cpp (106) createUIBackend UI: fallback on builtin code: QT5
[DEBUG:0@0.146] global /home/nvidiapc/openCV/opencv/modules/videoio/src/videoio_registry.cpp (197) VideoBackendRegistry VIDEOIO: Builtin backends(7): FFMPEG(1000); GSTREAMER(990); INTEL_MFX(980); V4L2(970); CV_IMAGES(960); CV_MJPEG(950); UEYE(940)
[DEBUG:0@0.146] global /home/nvidiapc/openCV/opencv/modules/videoio/src/videoio_registry.cpp (221) VideoBackendRegistry VIDEOIO: Available backends(7): FFMPEG(1000); GSTREAMER(990); INTEL_MFX(980); V4L2(970); CV_IMAGES(960); CV_MJPEG(950); UEYE(940)
[ INFO:0@0.146] global /home/nvidiapc/openCV/opencv/modules/videoio/src/videoio_registry.cpp (223) VideoBackendRegistry VIDEOIO: Enabled backends(7, sorted by priority): FFMPEG(1000); GSTREAMER(990); INTEL_MFX(980); V4L2(970); CV_IMAGES(960); CV_MJPEG(950); UEYE(940)
[video4linux2,v4l2 @ 0x5605da05dd40] No such input format: v4l2.

Yes, I was able to access the Webcam with cv::VideoCapture("/dev/video0") before.