For a long time you had to have the embed code to add a YouTube video to your posts and pages in WordPress.
With the recent upgrades, developers have made it so easy to add your YouTube vidoes anyone can do it! So, if you are not rocking the latest version of WordPress whic his WP3.9 better known as “Smith”, then be sure to upgrade right away.
The kewl thing about this is that you no longer need to use any embed codes, which saves space and make it so much easier to display the videos you want!
This only works if the owner of the video allows embeding.