Youtube Custom Field
Below you'll find some examples from the Custom Fields Youtube plugin.
This plugin lets you create new fields for 'Youtube videos' in any extension where Joomla custom fields are supported.
You can set a lot of parameters like video width and height (in % or px)
The PRO version also has options to hide or show related videos,choose your color, autoplay and allow fullscreen.
Youtube - Classic mode:
Youtube - Responsive mode: