https://youtube.com/watch?v=7V6FFeZdFz4
An example of how you can embed YouTube videos in a link card. Link leads to this video on YouTube.
If you have any problems with the Chronoblog, or you have interesting ideas, write to the github issue: github.com/Chronoblog/gatsby-theme-chronoblog/issues
You can also contact me on Twitter: twitter.com/Ganevru