If you want to the user name that appears under the video in the course gallery page and in the video page, currently the only way to hide the user name is using CSS.
In order to upload your own CSS file please follow the instructions below: 1. Log in to the KAF admin instance site 2. Click on Cssupload from the left manu, enable the module and click save. 3. Upload the attached css file under additional sections. 4.Click Save.
For your convenience I recorded that process: http://www.kaltura.com/tiny/o5xue