The San Francisco skate crew GX1000 is a loosely organized gang of misfit skateboarders who are bound together mostly by a shared appetite for positive vibes, high speeds, and copious amounts of Northern California’s famous high-potency marijuana. Some of the crew, whose online video releases have made them a sensation, are pro skaters. Others are amateurs. All of them are unflinchingly confident and freakishly physically gifted.