CKEditor does not load video plugin

I am using CKEditor 4.8.0

The problem here is that it does not load the video plugin

I have made these configurations in the config.js of the ckeditor

Video plugin:

config.extraPlugins = 'video';

HTML5 Video Plugin

config.extraPlugins = 'html5video';

Neither of these two settings has helped me.

HTML code

<form action="" method="post">
<textarea name="editor" id="editor">
</textarea>
<br>
<input type="button" value="Subir" name="boton" onClick="agregar();">
<script>
var editor = CKEDITOR.replace('editor');
</script>
</form>