Do I need to add media controls to MP4s that only shows for 5-10 seconds? 508 Compliance

I will often add MP4 videos from the Articulate library in my modules for very short periods of time - 5 to 10 seconds usually, as I like a lot of movement and visual interest. They are just enhancements, decorative, really, like a video of steaming 0s and 1s when I'm talking about data.. Or if I'm talking about analytics, an MP4 of moving bars and charts that I shrink down to fit within a monitor illustration. Is this practice accessible? I do have them autoplay and haven't been adding start/stop/play buttons, as they are only very briefly on screen. These modules are for a government client and 508 compliance is required. Do I need to add a tiny stop button to say, that shrunken down 'analytics' MP4 playing in the monitor for 6 seconds?