Videos won’t render

Hello!

I am unsure if this issue is related specifically to the install of my new theme Polity Pro, but my embedded gallery videos are no longer playing. In Chrome, the player displays a black screen with no controls on the video and a message to download the file, and in Firefox it will play the video, however, I have to right click and choose to play the files. Nothing is displayed in the Safari version, execpt the black screen.

Any insight or workarounds to resolve this issue are greatly appreciated!

Here is the link to my site: http://nationalguardsfrc.org/gallery