Rafael Paulino

With this plugin you can place an iframe inside the TinyMCE text editor. 
You click a button in TinyMCE and a window appears to place the iframe data. 
Then just click on Ok and a shortcode is inserted with the iframe data and on the front the iframe is presented.
Com este plugin você consegue colocar um iframe dentro do editor de texto TinyMCE. 
Voce clica em um botão no TinyMCE e aparece uma janela para colocar os dados do iframe. 
Depois é só clicar em Ok e um shortcode é inserido com os dados do iframe e no front é apresentado o iframe.

Rafa TinyMCE Iframe

With this plugin you can place an iframe inside the TinyMCE text editor.

Dan Rossiter

This plugin, like most things useful, grew out of a need. I had a <a href="http://www.prezi.com/recommend/qv1ms7qvtplw" rel="nofollow ugc">Prezi</a> 
and I had a WordPress blog. I Googled for a few hours, trying to find a way to embed one within the other, and found some 
dirty hacks that ended up not working, as well as a plugin or two that didn’t work, or only half worked. When I realized 
that there were no good solutions for this issue, I decided to create one.
This plugin is based on simplicity, making it extremely robust. On the back end, it is actually only a few lines of code. 
It takes the embed code that Prezi provides when clicking the share option through their site and simply inserts the 
necessary values that are needed to render a working Prezi.
I hope that you all find this plugin as useful as I have!
If this plugin has been helpful, please take a moment to 
<a href="https://wordpress.org/support/view/plugin-reviews/prezi-embedder#postform" rel="ugc">rate it</a>!

Prezi Embedder

This plugin allows the user to quickly & easily embed a Prezi in WordPress site by directly implementing the published iframe embed code.

Rafa TinyMCE Iframe vs Prezi Embedder