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Firefox:

media.autoplay.enabled = false

Block scripts at one level or another. On that particular page, it goes assets.bwbx.io -> cdn.gotraffic.net -> imasdk.googleapis.com which introduces some XHR from hopx.cedexis.com and (a subdomain of) akamaihd.net, and the video plays.

I love uMatrix.

I usually end-up opening the dev-tools and deleting the html tag...

Just removing <html> does the trick?

I'm assuming they meant deleting the <div class="video-player"> or <video> HTML element itself.

:D

If using chrome try this extension: Disable HTML5 Autoplay. Works pretty well and real life saver on many "disrespectful" sites.