I tried to embed the .mp4 video in my Confluence 6.1.0 page. Somehow the embedding gets done, but cannot be viewed.
This bug report (Multimedia File Won't Display with Autoplay is Unchecked) implies that the video will play if the Autoplay option is selected. Is that the case with your instance?
What do you see when the video won't play? Is there an error message in the browser?
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