We looked up the word 'Vignette' before writing this up about the new Halo 4 'vignette' from Microsoft and 343 called Halo "4: Forward Unto Dawn" and which is about capturing the flag.
The nearest we can see to the correct definition for the video - which is described thus: At Corbulo Academy of Military Science, cadets master many training exercises to simulate combat missions. Two cadets share their memories of childhood, when Capture the Flag was just a game with less deadly stakes", is "any small, pleasing picture or view". Anyway, the video is below, it's got cool, real-live people. Watch it.