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In nautilus the image/video previews are generated by the app totem-video-thumbnailer Check if you have it install by running:
ls -l /usr/bin/totem-video-thumbnailer
Second, you need the proper codecs installed.
For 32 bit systems you need:
yum -y install gstreamer-plugins-bad gstreamer-plugins-bad-free-extras gstreamer-plugins-bad-nonfree gstreamer-plugins-ugly gstreamer-ffmpeg
whereas for a 64 bit system you need:
yum -y install gstreamer1-libav gstreamer1-plugins-bad-free-extras gstreamer1-plugins-bad-freeworld gstreamer1-plugins-base-tools updates gstreamer1-plugins-good-extras gstreamer1-plugins-ugly gstreamer1-plugins-bad-free gstreamer1-plugins-good gstreamer1-plugins-base gstreamer1
In order to install these codecs you need to install the RPM fusion repositories.