Hi Jean,
The only way you can do that is to make sure the current install is fully up to date as far as the DB schema goes and then install a fresh instance of the same version [preferably latest which is 11.14.0 at the moment] and then, backup and drop all the kaltura.* DBs from the new install and import them from the old.
You can use /opt/kaltura/bin/kaltura-export-db.sh to export all the Kaltura DBs, then edit the resulting SQL and replace the old hostname with the new one and import it to the new system's MySQL and copy over all the assets under /opt/kaltura/web/content/ onto the new system.
Make sure the new system has the same Kaltura version as the old one though, cause otherwise, it will not work.
Please be sure to backup ALL DBs from both instances, just in case.
Once done, use:
# /opt/kaltura/bin/kaltura-sanity.sh
To verify the new install is sane.
Let me know should you require additional assistance.