If you have a Smart Cloud :
Click on the menu with the 3 dots on the right hand side of Subscriptions > click on Trash
Select the video to recover and click on the folder icon "recover in collection"
Select the collection you want to recover the video to and click on Recover
On a dartfish.TV channel:
Change your URL link from www.dartfish.tv/Videos?CR=p(ID of your channel) to www.dartfish.tv/Trash?CR=p(ID of your channel)
Your deleted videos are kept 10 days in the Trash