方法来源网上，非原创。
1. Install the nux repo
$> su -
$> yum update # optional but recommanded
$> rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
$> rpm -Uvh https://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm
$> rpm -Uvh http://li.nux.ro/download/nux/dextop/el7/x86_64/nux-dextop-release-0-5.el7.nux.noarch.rpm
2. Install the necessary packages
$> sudo yum install vlc