Standard object detection(be it 2D or 3D) tends to represent the bounding box as a rectangle or a cuboid(for 3D).
Wanted to know if it’s possible to enclose the detected object by any other shape say a triangle or a circle,and if yes then how should I go about it.

I know that standard box coords are in the following form

(x1,y1) (x2,y2) where (x1,y1) represent the top left coordinates and (x2,y2) represent the bottom right.

Here instead of having a rectangular bounding box,I was wondering on how to use these coordinates to draw a circle enclosing the car.
Another image(better result)

I think the outermost circle seems like a good approximation for the bounding box.I am assuming we use the top left and bottom right coordinates to find the mid point,and the radius and then we use that information to obtain the circle?