No need to be left wondering. While I'm not sure these are the videos mentioned, it's not hard to find some just by googling for it. Or maybe don't, I wish I didn't.
Isn't the point of moderation/censorship to avoid having these videos widely-shared? These videos exist, they are fairly easy to find on specialized websites. Some are fake, but a lot are genuine. Videos showing executions during wars in Chechnya or in the middle east and such.