If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
as far as I can see this isn’t easily possible because of the structure of the slider (fullwidth slider area).
The background of the captions is set with an image, in the demo it is located here: http://www.kriesi.at/themes/broadscope/wp-content/themes/broadscope/images/skin1/bg-trans.png
You can modify the image, or change the CSS to a fixed colour (or RGBA if you’d like a % of transparency).
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