OBS

sudo dnf install https://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm https://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$(rpm -E %fedora).noarch.rpm

sudo dnf install obs-studio

codec

sudo dnf install gstreamer1-plugins-good gstreamer-ffmpeg gstreamer1-libav

install the OpenH264 codec implementation and its extensions for Firefox and gstreamer.

sudo dnf config-manager --set-enabled fedora-cisco-openh264
 
sudo dnf upgrade
 
sudo dnf install gstreamer1-plugin-openh264 mozilla-openh264
 
# Afterwards you need open Firefox, go to menu -> Add-ons -> Plugins and enable OpenH264 plugin.

For NVIDIA Hardware accelerated encoding make sure you have CUDA installed (in case of an older card, install xorg-x11-drv-nvidia-340xx-cuda instead):

sudo dnf install xorg-x11-drv-nvidia-cuda