It is always worth checking the videos out, but I would recommend going a step further and clicking on the youtube link to open the video actually direct from youtube.
Quite a few of these have links to other creations and downloads.
Here’s the link to the video for Pianochord by Quetzal Marchiori which fortunately has the original dropbox download (I have deliberatley struck through the link to stop it automatically loading the video on this post);
btw if you haven’t used dropbox before, you don’t need to register or sign in to download.
Just click on the Download button at the top right and select Direct download.
This will allow you to download the whole zip file to wherever you want on your computer.