I’m using the Notebook theme from ElegantThemes and as you can see in the demo, when you click on a video post, the video is displayed embedded in the pop-up window.
But, when I make video posts and post a valid YouTube video link, it displays it just like a link. I even uploaded the demo/filler posts that ElegantThemes has provided for Notebook, and even those filler posts don’t display the video embedded.
Here’s a screenshot of my problem:
Read more here: Embedded video post in Notebook [ElegantThemes]