Always Show Controls Default WordPress Video Player

When you add a video, like an MP4, to a WordPress site (I’m using a modified Twenty Thirteen theme) while using the default video player, you can see the code appear something like this:

[video width="960" height="720" mp4="https://sample.mp4"][/video]

I want the play bar/controls to always appear on the video rather than disappear after a few seconds when the video is playing. I’ve tried modifying the video player code:

[video width="960" height="720" controls="true" alwaysShowControls="true" mp4="https://sample.mp4"][/video]

None of that works nor anything else that I’ve tried in this manner. Any suggestions? Modifying the media.php page looks daunting, and I’d have to repeatedly change it every time that I update WordPress. Yes, I could use a plugin, but I’m curious about this now.