When you have no need for the viewer to click on the Pause Screen itself, you can 'hide' it. The video will stop playing until the user performs an action like clicking a button.

This can easily be realized in two steps:

Step 1. Make the background of the Pause Screen completely transparent

Step 2. Enable the 'Hide play button' feature. This way, you block the player. Now the viewer can't just press play anymore, they'll have to click on one of your interactions to continue watching the video.