Hello,
I know this is an old thread, but for the sake of anyone searching this topic, a good solution to this is to add the video to your base layer, and then create a new layer that is set to appear when the timeline starts.
- On the new layer, ensure that you have disabled the "Hide other slide layers", "Hide objects on base layer", and "Pause timeline of base layer".
- Next, make sure you have enabled the option "Prevent the user from clicking on the base layer".
This should allow your video to play in the background on the base layer, and disable the native "play/pause" when a user clicks directly on the video object. If you have other items that need to sync or work with the video layer, it would probably be best to keep them on other layers (not the base layer).
Adam