Once you have uploaded your view, go to My Content -> Videos, then click the pencil icon next to the video you wish to share.
Now you can set the permissions for who can view this video:
If you want all staff and pupils to be able to view the video, click Allow everyone in your company to view this video. Otherwise add people/channels/groups using the Share With box.
Once you have set the permissions, you can click on Share at the bottom right and copy the direct link.