How do you create the gallery (images) background such as on this site. I'm really interested in using this design and was wondering what code or process is needed to complete.

I'm curious how this website (https://www.nicoaguilar.com/) created its gallery background of images with a hidden video, but does have a visible player button in the middle. I would greatly appreciate any help with creating this in my own website. 

Thank you. 

They used Cover Page in SS 7.0 version

With Small Images, they used Gallery, then use CSS code to make slide images smaller as current. (You will need a Business Plan or higher to use CSS code in Cover Page)

With Video, I think it should be a setting in Cover Page