Hi
The slider in our theme is an image slider where you can add the title, content and the link but the pop up video in slider is not available in our theme you just have to add the link for the slider. As per your requirement you need to use any plugin.
This plugin might help you:
https://www.wonderplugin.com/wordpress-slider/examples/wordpress-slider-with-lightbox-popup-id26/
Thank You
