The issue is you cannot easily override the browser's own controls when videos are deployed on popup layers. You could with a purpose-designed video player, but for a couple of videos that's a lot of hard work.

Here's an idea (borrowed from an Acorn concept) of a page within a placeholder: https://initiostar.co.uk/demo/VideoPopup/

A 'video popup' really - works OK with Chrome & Edge, but I've yet to loose the scroll bars on Firefox.

It may be help?

Gary