Supported videos include:Hulu, YouTube (Long), YouTube (Short), Vimeo, Dailymotion, Metacafe, Google, facebook, Facebook Shares
Observe.
Click this.
Insert the URL to your video, in this case: https://www.youtube.com/watch?v=_rwW8P3BnXE
Obviously, click OK.
The finished string of code will look like this:
[video=youtube;_rwW8P3BnXE]https://www.youtube.com/watch?v=_rwW8P3BnXE[/video]
Enjoy!