After the 7 days have past and you have been paid out, you can't delete the content. It is then on the Steem blockchain forever. As far as uploading videos, I had the same problem last night so I'm trying to figure that out too.
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As soon as it's posted, there is no fully deleting the text. You can only "delete" hence edit the part that is commonly picked up by particular sites, not what is left on the blockchain.