gistfile1.txt

# Install the tools
sudo dnf install v4l2loopback v4l2loopback-utils ffmpeg

# Create the virtual camera device (persistent across reboots)
echo 'v4l2loopback video_nr=10 card_label="Compatible Camera"' | sudo tee /etc/modules-load.d/v4l2loopback.conf

# Load it now
sudo modprobe v4l2loopback video_nr=10 card_label="Compatible Camera"

# Create the bridge (converts NV12 to YUYV which most apps expect)
ffmpeg -f v4l2 -input_format nv12 -i /dev/video0 -pix_fmt yuyv422 -f v4l2 /dev/video10

Then...create a simple systemd user service:

mkdir -p ~/.config/systemd/user
cat > ~/.config/systemd/user/camera-bridge.service << EOF
[Unit]
Description=Camera Bridge
After=graphical-session.target

[Service]
ExecStart=/usr/bin/ffmpeg -f v4l2 -input_format nv12 -i /dev/video0 -pix_fmt yuyv422 -f v4l2 /dev/video10
Restart=always

[Install]
WantedBy=default.target
EOF

systemctl --user enable camera-bridge.service
systemctl --user start camera-bridge.service