How to decrypt javascript string hidden content?

In Google Chrome there is a wide variety of extensions to download background videos or at the same time use the developer tools and sources , you can view the links with the website.

But for some reason there is a chain encoding with javascript that does not allow to find the video, it is a very good technique.

In this link you can better visualize the code, and in this link you can visualize the background video.

Can you explain to me how you can read a javascript encoding or string

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