The content type “Document Collection Folder” at “…” is sealed.

 The content type “Document Collection Folder” at “…” is sealed - SharePoint 2013

In an Asset Library When user tries to upload a Video file below error pops up 

but this won't pop up if a user tries to upload image files

Solution to Above issue is We need to Activate "Video and Rich Media"  Feature at SiteCollection Level and he has to delete the existing Asset library and create the new Asset library.