Well looked to me like it was on a sub orbital track to the NW assuming the camera was over LA. It was going away. I have seen a lot of launches from the cape. It sure looks like a solid fuel booster and appears to begin staging at the end of the clip. I have not seen a contrail going at that speed. Airliners only fly at 550knts.
Have you ever seen a contrail twist like that one?
Not when they're climbing, and not below 18000 feet, they don't. And their rate of climb doesn't exceed 5000 feet per minute. (Max legal speed below 18000 feet is 250 kts.)
ML/NJ