bogdan

Embeds are needed to embed video from youtube or to embed Google Map or just to embed content from external page. 
WordPress removes embed when you switch from “HTML” to “Visual” tab because of the security reasons. 
So you can embed object code using this shortcode <code>[iframe src="http://player.vimeo.com/video/3261363" width="100%" height="480"]</code>.

iframe to embed

Embeds are needed to embed video from youtube or to embed Google Map or just to embed content from external page.

firimar

This basic plugin adds the Magnific Popup lightbox script to wordpress site and works with single images, iframe links and dialogs.
All you need to do to use Magnific Popup on a link is to add specific css class to ‘a’ tag. CSS class names can be configured on settings page.
For images you can use alt attribute to add captions.
Thanks to Dmitry Semenov for the original script: http://dimsemenov.com/plugins/magnific-popup/
This plugin is only basic version and does not support all features of Magnific Popup yet.
Plugin provides following functionality:
<ul>
<li>Single image popup.</li>
</ul>
Usage example html: 
 <a href="http://site.com/full-size.jpg" rel="nofollow ugc"></a>
<ul>
<li>Image gallery popup with navigation.</li>
</ul>
Usage example html:
 <a href="http://site.com/full-size-1.jpg" title="title1" rel="nofollow ugc"></a> 
 <a href="http://site.com/full-size-2.jpg" title="title2" rel="nofollow ugc"></a> 
 <a href="http://site.com/full-size-3.jpg" title="title3" rel="nofollow ugc"></a> 
 <a href="http://site.com/full-size-4.jpg" title="title4" rel="nofollow ugc"></a>
<ul>
<li>Iframe popup (can contain external page, youtube video, google map, etc.)</li>
</ul>
Usage example html: 
 <a href="http://www.youtube.com/watch?v=b0FhD19zj4I" rel="nofollow ugc">Video</a> 
 <a href="https://maps.google.com/maps?q=221B+Baker+Street,+London,+United+Kingdom&hl=en&t=v&hnear=221B+Baker+St,+London+NW1+6XE,+United+Kingdom" rel="nofollow ugc">Google Map</a>
<ul>
<li>Dialog popup (pops up a div from the current page)</li>
</ul>
Usage example html: 
 <a href="#dialog" rel="nofollow ugc">Dialog
 Test dialog content
 </a>

WP Magnific Popup

Plugin to add the Magnific Popup lightbox script to wordpress site for single images, image galleries, video, maps, dialog popups and other.

iframe to embed vs WP Magnific Popup