Hi,

Here is the MOD you are after:

http://www.youtwatonline.com/Clear-Video-Folder.zip
Download it and upload the folders to your server, overwrite where required.

The link for the delete page is at the bottom of the page next to the logout in the admin section.

Please note on clicking the link it will automatically delete all the files inside your video folder.

Regards,
Mat. 8)