It's not possible using the Multimedia macro, so I have made a feature request for this:
I would recommend if you're on Confluence Server, you can enable the HTML macro and use it to embed a video that way:
Here's my example:
If you only want it to loop but not autoplay you can remove the 'autoplay' bit in the HTML.
Note that this is not possible in Confluence Cloud.
You can make the height and width of the video fill the confluence page by adding height="100%" width="100%" into the HTML code after video controls autoplay loop.
If you want the video to be smaller than the full page you can adjust the percentages in height and width and the video will become smaller. You can also use a pixel number to adjust the size and you would do that by removing the percentage size and typing in the pixel sizes you wish.
<video controls autoplay loop height="100%" width="100%">
<source src="/download/attachments/000000/name-of-video.mp4" type="video/mp4">
The link in shannons comment will help you to get the HTML url for the video if you are using the Multimedia macro.
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