The original video was published in September 2013 on this channel https://www.youtube.com/watch?v=rSYR6NoGkD0
This is a shortened version of that video. It shows children being instructed by terrorists to act like they have been hit with Sarin gas, they convulse, they’re eyes blink and they froth at the mouth with fake foam applied to their faces by terrorists. A of children applaud. A man in a Mickey mouse costume tells them it’s all fun.