In some networking sites, admins would like to allow its members to upload videos only from their computer but at present you will always have the option to upload from Youtube and Vimeo.
This article with show you how you can remove Youtube and Vimeo
First of all Locate this file :
you will See
//YouTube, Vimeo $video_options = Array(); $video_options = "YouTube"; $video_options = "Vimeo";
you need to change it to:
//YouTube, Vimeo //$video_options = Array(); //$video_options = "YouTube"; //$video_options = "Vimeo";
By commenting out these three lines you remove the options to upload from youtube and vimeo from SE.
This works with the Default Video Plugin and Wall.
After each upgrade of the video plugin you will need to redo this change.
Not Tested with Third party mods.
Always make backups of files changing to ensure you can always revert back if needed.