Youtube URL from JavaScript Popup

I'm trying to get the URL of YouTube videos that are embedded in a JavaScript popup. The page below is a good example; the "Product Closeup Video" link under the main image opens a popup.

I'd like to be able to scrape the url of the youtube video that is embedded. I've tried just about everything I can think of with no luck. Any help or suggestions would be hugely appreciated.

Url: https://www.petretailsupply.com/p.cfm/basic-dog-hoodie-heather-gray

Fortunately, the URL is right in the source code, so it is a merely a matter of grabbing the HTML (Type: HTML) then extracting it with a Regex.

{"_id":"petretailsupply","startUrl":["https://www.petretailsupply.com/p.cfm/basic-dog-hoodie-heather-gray"],"selectors":[{"id":"get_youtube_url","type":"SelectorHTML","parentSelectors":["_root"],"selector":"div.largerView","multiple":false,"regex":"www.youtube.com.{4,41}autoplay=1","delay":0},{"id":"get_product_name","type":"SelectorText","parentSelectors":["_root"],"selector":"div.dTitle","multiple":false,"regex":"","delay":0}]}