Pause and volume button in video background

Hi Team,
I’m having a dilemma. I’ve tried everything but I can’t get it right. I want to add:
1 button to pause the video
1 button to lower the volume
I’ve tried using a “code widget” using JavaScript, but it just doesn’t take it into account. Has anyone achieved something similar?
I’ve posted the demo example in case anyone has an idea.
Thank you very, very much.
urL: 13.78 MB file on MEGA