If you are facing issue with playing media files, it is because you do not have media codecs in you machine. You need to perform following 2 steps:
Install and enable RPMFusion Repos:
Following is the command to install and enable RPMFusion repos:
su -c ‘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’
Install Media Codecs:
Following is the command to install media codecs:
sudo dnf install gstreamer-plugins-bad gstreamer-plugins-bad-free-extras gstreamer-plugins-bad-nonfree gstreamer-plugins-ugly gstreamer-ffmpeg gstreamer1-libav gstreamer1-plugins-bad-free-extras gstreamer1-plugins-bad-freeworld gstreamer1-plugins-base-tools gstreamer1-plugins-good-extras gstreamer1-plugins-ugly gstreamer1-plugins-bad-free gstreamer1-plugins-good gstreamer1-plugins-base gstreamer1
References:
Technical Articles 
If you want an easier way just use Korora. It is Fedora with all that done for you. https://kororaproject.org/
BTW you should update as 23 has been EOL for some time. That won’t be any more updates or support for it.
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