The video does not show full width in my browser- which is currently Chrome. Did you want it to be full width on the page? If so, are you using a specific theme customizer? Customizers can help with stuff like this. The video may also be the biggest size it can be already, as you currently have it set to 100% width. I would imagine that making it any larger would cause the video to be blurry. You may also want to try centering the video on the page?
