I can not see the video but by the description I imagine you are trying to create 4 viewports with views of different points of your object.
If this is easy to reslver, simply adjust the line of each of the 4 cameras with normalized values.
To test create an empty GameObject and 4 cameras inside it, a script to manipulate these cameras and adjust their line, something like:
public class CameraControl : MonoBehaviour {
public Camera[] cameras;
// Use this for initialization
void Start () {
cameras[0].rect = new Rect( 0.0f, 0.0f, 0.5f, 0.5f );
cameras[1].rect = new Rect( 0.5f, 0.0f, 1.0f, 0.5f );
cameras[2].rect = new Rect( 0.0f, 0.5f , 0.5f, 1.0f );
cameras[3].rect = new Rect( 0.5f, 0.5f, 1.0f, 1.0f );
}
}
Drag this script to the parent GameObject of the cameras.
Include an object in the scene and position the cameras as you want them to be showing your object (in 4 different positions and angles).
Run the game and make sure it is + - this;)