Hi,
The theme supports WordPress’ built-in video header functionality for the homepage of the site.
To use this you’ll need to switch the theme’s landing page slider section (if you use the landing page) to display the header image (and video) instead of the default banner image.
Beside WordPress’ homepage header video feature, neither Bravada nor our companion Serious Slider plugin support videos slides. To add video sliders to your site you’ll need to look for and use a separate plugin that provides video slide(r)s functionality.