How to Implement a YouTube Embedded Plug-in in the CKEditor

Let me ask you a question.

I am using Ckeditor as a CDN and would like to implement the http://ckeditor.com/addon/youtube plug-in.
It's not going well.

to config.js

CKEDITOR.plugins.addExternal('youtube', '/myplugins/youtube/', 'plugin.js');
config.toolbar+=[{name:'insert', items:['Image', 'Youtube']}];

However, the icon was not displayed and there were no errors on the console, so I was at a loss.

I would appreciate it if you could let me know.