We've launched rockets for about a hundred years of various types, including literally hundreds of thousands during the past 60 years or so, and I've *NEVER* seen any images remotely similar to this.
True. And I'm not saying that it is or isn't a rocket, because I have no idea. But, just to play devil's advocate, cameras/video cameras have never been as prevalent throughout the world like they are today. Today, everyone with a cell phone has one. Pretty much everyone you know has a digital camera. And pictures/videos spread so unbelievably fast due to the Internet. My assumption, if this was a Rocket, is that it has happened many times in the past but never could be documented so well as it could today.
