Design a VAST pre Roll iframe to play in front of my HTML5 video player

We want to use an html5 player provided by Streamable, and we want to add an iframe (or other) which triggers a video ad in front of the player, when a user clicks the play button. You can see an integration of the player in this url: [login to view URL] This is an example of the ad code we want to pop before the video: [login to view URL][WIDTH]&height=[HEIGHT]&dnt=[DO_NOT_TRACK]&ip=[IP_ADDRESS]&ua=[USER_AGENT]&pageurl=[PAGEURL]&contentid=[CONTENT_ID]&contenttitle=[CONTENT_TITLE]&contentlength=[CONTENT_LENGTH]&contenturl=[CONTENT_URL]&rnd=[CACHEBUSTER] We're Looking for a professional able to understand what we need and find a solution for us. We can try to find other ad codes if this does not work. Thanks to all for your time.