Add property Edited to video entity
Adapat video edition form to Video::Edited
Add edited condition in

Redirection based on user status: NXmen are sent to the video add form
page, other users to a page indicating that the video is being
uploaded, with probably a cool bar showing the progress) . If the video
is already edited but not yet encoded, everyone is redirected to the
pretty page.
Change redirection after adding a video

Redirect user to admin page after successfully editing a video (will be
add video page when it exists)
Add Edited lines to datafixtures