Getting 3rd party embedded videos to show up in video search results ?

I have a porn autoblog where a scraper embeds thousands of videos from big porn sites like pornhub

slowly but surely they are all getting indexed, but they do not show under the video search results. Only web page results without a thumbnail as if it were just a normal page

XNXX is a prime example of a site that hosts 3rd party videos yet their embeds show up in the video searches on Google and Bing and others with a thumbnail as if the video were actually theres

What to do?