Misunderstanding of that thread. Difference with SWF output is that the control panel of Event video appears in HTML5 only when you hover over the bottom of the video. Maybe less variations in style are possible as well but that control panel is functional.
You don't have any control over the control panel used for Event video, because that type of video plays independently from Captivate. What you want can be done if you insert the video as Slide video, because that video is synchronized with Captivate's timeline, and you can use custom buttons.