gpu-screen-recorder: add page (#17436)

pages/linux/gpu-screen-recorder.md

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+# gpu-screen-recorder
+
+> Record the screen and encode the video with a GPU.
+> More information: <https://git.dec05eba.com/gpu-screen-recorder/about/>.
+
+- Select a source using a desktop portal and record it:
+
+`gpu-screen-recorder -w portal -o {{path/to/video.mp4}}`
+
+- Specify a specific video source:
+
+`gpu-screen-recorder -w {{screen|DP-1|HDMI-A1|...}} -o {{path/to/video.mp4}}`
+
+- List video capture sources:
+
+`gpu-screen-recorder --list-capture-options`
+
+- List audio capture sources:
+
+`gpu-screen-recorder {{--list-audio-devices|--list-application-audio}}`
+
+- Record using the replay buffer:
+
+`gpu-screen-recorder -w {{screen}} -r {{30}} -c {{mp4}} -ro {{path/to/directory}} -o {{whatever}}`
+
+- Capture a video from the replay buffer:
+
+`pkill -SIGUSR1 -f gpu-screen-recorder`
+
+- Run `gpu-screen-recorder` in the background:
+
+`systemctl start --user gpu-screen-recorder`