This plugin lets you embed media resources directly in the editor.
The plugin introduces a widget that allows you to embed resources (videos, images, tweets, etc.) hosted by other services (called the "content providers") in your content. By default, the plugin uses the Iframely proxy service which supports over 1715 content providers such as YouTube, Vimeo, Twitter, Instagram, Imgur, GitHub, or Google Maps.
Note: The default configuration uses the public service provided by Iframely which has some limitations. If you want to continue using Iframely, it is recommended to create your own account and use your API key. Some services (like Google Maps) require setting up your API key, too, and adding it to your Iframely configuration.
See also the Semantic Media Embed plugin that creates embedded media resources with a semantic output and the Auto Embed plugin that automatically turns a media resource URL pasted into the editing area into an embedded resource.
This is an official plugin provided and supported by CKEditor developers.