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?
Forough Farrokhzad’s iconic, widely quoted poem (Rebirth, 1962) . . The Bird May Die I feel sad, I feel blue. I go outside and rub my cold fingers- on the sleek shell of the silent night. I see that all lights of contact are dark, All routes to relate us- are blocked. Nobody will introduce me to the sun, Nobody will take me- to the gathering of doves. Keep the flight in mind! The bird may die. . . (my translation, September 2006, Montreal) . by: Persian Poetry in English