CongBom

To get meta value in front-end, use <code>get_post_meta()</code> with meta key is <code>youtube_id</code>.
Example:
Print YouTube video ID: 
 ID, ‘youtube_id’, true);?>
Thumbnails: 
 <img src="http://img.youtube.com/vi/ID, ‘youtube_id’, true);?>/mqdefault.jpg” alt=”” />
Video player:
<iframe src="http://www.youtube.com/embed/ID, ‘youtube_id’, true); ?>” width=”588″ height=”331″ frameborder=”0″ allowfullscreen>

YouTube metabox

Create YouTube meta-box for post with live preview

WebMan Design | Oliver Juhas

<blockquote>
Before you rate/review the plugin:
Please note that the plugin was created for WordPress theme developers. If you are a normal, non-tech-savvy WordPress user, this plugin will be disappointing for you and you don’t need to install it as it was created for different purpose.
If you are a theme developer and experience any issue with the plugin, please submit a support ticket.
</blockquote>
WebMan Amplifier is WordPress plugin that provides pack of features for theme developers. The plugin was build to help with, and simplify the WordPress theme development process.
This plugin was created primarily for <a href="https://www.webmandesign.eu/" rel="nofollow ugc">WebMan Design themes</a>, but it works with any other theme as well if you declare a support for it in the theme’s code.
<h4>Features</h4>
<ul>
<li>Well thought shortcodes with simple and fast Shortcode Generator and integration with <a href="https://wordpress.org/plugins/beaver-builder-lite-version/" rel="ugc">Beaver Builder</a> page builder (with support for <a href="https://wpml.org" rel="nofollow ugc">WPML</a> multilingual plugin)</li>
<li>Custom post types: 
• Projects – to create your own portfolios 
• Testimonials – to manage your customers or partners testimonies 
• Staff – to manage your team members 
• Content Modules – to create an icon boxes, services boxes or a content injection anywhere on your website 
• Logos – to manage your clients and/or partners logos list</li>
<li>Custom widgets 
• Contact – to display your contact information 
• Submenu – to display a subpages of the current page 
• Tabbed Widgets – to display any widgets in tabbed interface 
• Posts – to list posts or portfolio projects 
• Content Module – to display any Content Module post</li>
<li>Metabox generator</li>
<li>Fontello.com icon font uploader and simple integration</li>
</ul>
<h4>Additional Resources</h4>
<ul>
<li><a href="https://wordpress.org/support/plugin/webman-amplifier/" rel="ugc">Have a question?</a></li>
<li><a href="https://profiles.wordpress.org/webmandesign/#content-themes" rel="nofollow ugc">Grab a free theme</a></li>
<li><a href="https://www.webmandesign.eu" rel="nofollow ugc">Visit WebMan Design</a></li>
</ul>
<h4>Isotope Licensing</h4>
Please note that the plugin integrates an Isotope JavaScript filter. This script is released under GPL v3 license for non-commercial use. If you intend to use the plugin for commercial purpose, please purchase the <a href="http://isotope.metafizzy.co/license.html" rel="nofollow ugc">Isotope license</a>.

WebMan Amplifier

Amplifies functionality of WP themes. Provides custom post types, shortcodes, metaboxes, icons. Theme developer's best friend!

YouTube metabox vs WebMan Amplifier