Under Admin -> Attachments, set the maximum file size to something that is ok for documents, but useless for video. This won't stop it, but your users won't be able to upload videos of much use.
If that's not going to work for you, then you need add-ons that can scan and refuse attachments - there's a couple in the marketplace, have a look for them.
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An efficient enterprise content management system, or ECM, is a must-have for companies that create work online (cough cough, all companies). If content calendars, marketing plans, and bu...
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