When I see hot/bright object floating along with smaller hot/bright bits falling off, I tend to think "Chinese wedding balloon, shedding bits of fuel and debris."
Can somebody knowledgeable speak to the very bright plant at the end? I'm assuming "very reflective of IR in sunlight" or very warm from the sunlight and emitting IR -- but it seems surprisingly bright to my untrained eye.
(Is this really IR footage? Everything that flies through the frame seems equally white/hot, including a bird and a bug at 15-20 seconds or so and elsewhere.)