Looks like the video player requires additional Javascript to run. you need to include the js in the assets.
It's fine to do so but the javascript will be loaded on application load which will increase the initial bundle size.
It's fine in most cases but you wanna watch what you're adding for fast applications.
The plugin tells you to add "<script src="
http://www.site.com/script.v1.js></script>" then you take the content of "src" and add it to the scripts array in the angular.json
Should be simple enough