Swapping out video links…

In parallel to the image inquiry… but unlike that topic… I eventually got lost looking for the URL info regarding those Dota2 YouTube videos that are used as background. I can see the links in the corresponding Div tags via Chrome developer mode etc., but I’m not sure what file(s) WP is using to include said links.

Q1: Any pointers? Should I be looking in php files related to header content?, or is this a .js thing perhaps? So embarrassing lol, but the more I mess with stuff the more I really want a firm grasp on this stuff.

Also – separate but somewhat related… Q2: how did your theme embed those Dota videos without volume?… like, is that a function in the WP/your theme code or is this a parameter that’s included in the YouTube link (e.g., making this up but something like “…&volume=none&….” in the url?

Thank you so much!!!

-Q