YouTube help in mobile setting with Agility theme

Hi guys:

I’m new to the forum and hope I’m writing in the right place. I have the agility theme, and having problems using the embed of YouTube. When I view the video on the home page, the video left and right side is completely cut off, and is not resized in portrait mode. Think of the video in the context of “the rule of thirds”.

The first and third thirds are cut off,and only the middle third is seen. This problem exist whether seeing it in landscape or portrait mode on the Iphone or tablet. What’s the best way to fix it?

Thanks for reading my message and look forward to hear your thoughts.