How to download videos from post but all videos comes from youtube

Hi,
I have my site where all the videos comes from youtube channel automatically using plugin, I did not add any video separately .
Now i want a download button in the end of video like this site

https://nocopyrightsounds.co.uk/info/ (this is wordpress too)

there is many plugins that allow you to download video but for this you need to upload the video first or give any link
but in my case all videos is comes from my youtube channel. I just want a download option at the end of every video.

Please help me if any one have an idea

Thanks