YouTube URL Plugin
http://www.youtube.com/watch?v=quwebVjAEJA&width=500&height=350
Here is an example:

Image Sizes:
- Post Featured (In Default Page Layout , 620, 0
- Post Category (Sidebar List of other Posts in a category), 300, 0
- Tour Guide and Advisors, 220 X 300
- Plain Box, 280, 150
Card and product boxes use images with a 1.5 Width to Height ratio. The image width will be sized first and the height adjusted to match. Note: the box shortcode was designed to size the image for a 3 or 4 column layout. Images will not size to fill a box in a 2 column layout - a Big Feaure post can be used to accomplish this .
- Jumbo Post (1 Column) 460, 332
- Big Feature Post (2 Columns), 460, 305
- Stacked Posts (posts shortcode inside a column in a 2 column row), 180, 120
- Stacked Posts (posts shortcode inside a column in a 3 column row), 100, 75
- Posts 3 Columns, 300, 204
- Posts 4 Columns, 220, 146
- Directory Profile, 300, 300
- Mega Menu Image from Post (in Widget Area), 260, 130
- Carousel Slide Default Page Layout, 620, 300
- Carousel Slide Home Page, 0, 360
- The Core Theme uses a 960 wide image.
- The Department Theme uses a 980 wide image