One of the main advantages of this method that it will help Google in image search by an image so it can find the images even if they are resized, flipped, or converted to gray scale.
For sure, this method may work also for videos knowing that videos are just successive picture frames.
I tried to make an image having a long word of random letters so it will never appear in search results in Google. I tried to search for the written word and no search results were obtained. May be it takes little time to apply the process or update the tags database. I am not going to write down the word because -for sure- Google will catch the image from it.