Custom Video pop-up Issue (when closing it)

Hello averyone, I hope you’re having a good day.
I need to end an issue for a huge client. I already read all the related topics and nothing makes me fix it. I share the link to my project below.
The problem is that when the modal is closed, the video and audio are still active. I have no idea of codes I am not a programmer I am a designer. I have already read everything on the subject worse surpassed me. Please I nedd your help guys and if anyone can guide me step by step with pears and apples I would really appreciate it.

Best regards.

Here is my site Read-Only:
(how to share your site Read-Only link)

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