In order to set the camera inside the car,
You need to change the camera controller to none with no collision and set the position and angle of the camera to the position and angle of the car inside a loop command.
Here is an example:
www.gamemaker3d.com/player?pid=01620779
We have also added a moving wheel object and decreased the car's window opacity in order to see better when the camera is inside the car. You can use the new car model from the example.
Regards,
Cyberix3D team