A while back I came across a bug that causes cars to continue moving when opening pohotmode in replay mode.
I was playing around with the bug and made a
nice shot. But then I wanted to test if the car hitbox would go through the camera or if it would move it to the side. It didn't move it to the side so then I thought maybe when the replay finishes I could make the car go into the camera (Since the cars stopped at the finish line when the replay finished).
So now onto how to do it:
1) Turn on rewind
2) Choose a vehicle and spot you want to take the photo in.
3) Wait around near the spot and then drive into the spot.
4) Rewind all the way to give you time to setup the camera into where the car will drive into it.
5) Open up the replay and leave the Right Trigger pressed and click A on the photomode option
6) Move your camera to spot where the car will drive in and then you will be inside the car
Video Version
Proof