Here I have no such video but I turned it off long ago.
If this is a forum or CNET.com or Download.com issue, please post with what web page or URL so others can check it out.
Read an example about a fix coming for Download.com at https://www.cnet.com/forums/discussions/the-welcome-to-cnet-video-is-sometimes-a-problem/
When I scroll down, situates itself in the right corner, blocking what I need to see?

Chowhound
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GameSpot
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TechRepublic