An image, seriously a cat image with a zoom-out and 80's elevator music...
Perhaps I am overthinking this video.
A high-quality video can take several days to create, but it is not guaranteed that anyone will view it.
You can also do as this guy did and take one photo, add music and a title, and then post it.
No script. No voice-over. There is no other than a photo and some generic elevator music.
It is called "Gentle Understanding Cat", and has received 82,000 views and 303 comments.