I have found some examples where the thumbnails and the background of the following YouTube videos has these characteristics:
- Cover album at the background of the video.
- The cover is also in higher size behing the "smaller" cover album.
These are some examples I found:
I'm not a web/graphic designer, but I found this design interesting. Did this kind of design has a name?1
1 I'm interesting in get any official documentation (if exists) about the name of this kind of design, because, looking in Stack Oveflow (about the grey boxes in YouTube), the only answer shows a name, but I don't know if this is a real-official name.