Slider Revolution – Using Alpha Transparency to make transparent background

I’m currently producing a slider with a looping video as the background and a title which doesn’t loop. I’m doing this by adding an HTML5 video layer and trying to remove the background.

The video was exported only as an alpha layer from After Effects with a transparent background. I added some code to the custom CSS of the slide which I found from someone trying to achieve the same outcome here

.tp-caption .html5vid {
-ms-filter: “progid:DXImageTransform.Microsoft.Alpha(Opacity=50)”;
filter: alpha(opacity=50);
-moz-opacity: 0.5;
-khtml-opacity: 0.5;
opacity: 0.5;
}

Doing this simply lets me change the transparency of the entire video, not just the background (which shows as black)

Can anyone assist?

Thanks!