woocommerce_product_thumbnails hook now depreciated? What would be a work around?

I am trying to add a video underneath the gallery of a single product page (woocommerce). When I add the hook "woocommerce_product_thumbnails" nothing happens. I noticed that on the visual guide to woocommerce hooks it says "woocommerce_product_thumbnails (may not work with the new product gallery since WC 3.0)". Is there a work around to get this to work again?

Here is my current code:

add_action('woocommerce_product_thumbnails', 'add_product_video');

function add_product_video(){

    echo "<iframe width='560' height='315' src='https://www.youtube.com/embed/JHN7viKRxbQ' frameborder='0' allowfullscreen></iframe>";

}