Create a repo file: /etc/yum.repos.d/jitsi.repo with the following content:

[jitsi]
name=Jitsi
baseurl=https://download.jitsi.org/jitsi/nightly/rpm/
enabled=1
gpgcheck=0

Or directly use the file https://download.jitsi.org/jitsi/nightly/rpm/jitsi.repo

Run yum install jitsi to install the latest jitsi build.