Usage of Audio / Video in your dashboards can help with increasing the appeal of your dashboards in order to support higher adoption rates. They can also serve as way to draw the user's attention to something (i.e., play a certain sound or video when the data changes and goes below a certain threshold).
While often used as an alert for negative events, Audio / Video can also be used for positive events. For example, they can be used on those dashboards you have wall mounted around your sales department to alert the team when a a new sale is made above a set value.
The implementation is simple using HTML5 tags injected into the HTML label control as demonstrated here: