From Sugar Labs

video playback on Sugar

1. go to root "su" in the terminal
2. type "yum update"
3. accept changes and let yum install updates (good idea?!)
4. try "yum install vlc"

or

try

yum install jukebox

or

try

yum install mplayer

Your mileage may vary.

.ogg videos just play from the journal, one click and they play.