I use firefox and have my autoplay policy set to aggressive no. There's an icon left of the address bar that shows a crossed-out play button when scripted video is prevented. If I click on that play button, I can select "always allow," and the videos will be allowed to play. That's all it took for me.

I set that option one day when a news website would autoplay a video every time I scrolled (I think it was the New York Times). This sent me into a fit of rage and now I prefer the inconvenience of having to reselect "allow all" almost every time I visit a site with video.