Hi Joe MacKenzie,
As per my knowledge; ThingWorx view just passes the video file to the device video player to play. there is no inbuilt video player in the ThingWorx view.
You can play the video using the onload event of the model as soon as the model load is complete but it will play in your device video player (full screen).
I too think PTC should add the feature to play the video within the ThingWorx view Experience.