Thank you for replying.
I originally inserted it as a multi-slide video but I didn't see any way of adding any controls. I want the video controls to be separate from any slide navigation, which is why I used an event video - you can specify a play bar for the video itself. However, I found that the video controls are not keyboard accessible.
What I mean by a popup is something that is hidden on the main slide until a button is pressed. Each button on the slide opens some extra information in a "popup" window. This particular video is in one of the popups. So this means I don't want it to start playing until its popup window is shown.
My question: is there is an action that I can add to a button or advanced action script to start playing the video when the popup is opened (or a "play" button is pressed)? If I add it as a slide video, I can control the timing, but the video isn't triggered by timing.