How to add VIDEO ( with URL ) to Product Page to Image Slick List ( Venture Theme ) ?

[GentMen]

Hi!

I am trying to add a video to the product page slick list - Little squares with images ( I believe it's called after inspecting the page source ).

I will attach a screenshot below where I am trying to add an OFFLINE autoplay/repeat play video ( Not with URL ).

Looking forward to a quick reply!