Resting the camera on the dashboard of the car to keep it relatively stable would be a good approach. Then it's just the car's movement and the cars outside that will create the blur and not camera shake. This will have to be experimental as far as shutter speeds and exposure are concerned. Obviously night time would work best if I am going to record light streaks. The camera pointing at back seat and kids with blur outside?
Chelsea and Joe's wedding took place at The Lake, White Colne, Essex. They hired a marquee and set up the wedding themselves in a field. The day had a bohemian, shabby chic and rustic vibe with lots oh homemade touches.