I can see why it shouldn't be shown on the internet as there are idiots that get bad ideas, but then that's true of everything that's twisted out of context these days isn't it?
The video does not show either cat in any distress, the cat in the box stays in the box quite willingly once the lid is taken of and doesn't even move when the owner gently starts to tip the box up. The kitten also does not attack the cat out of the box when it has the opportunity. So while it's perhaps misguided it's not showing any cruelty at all.