There are special 3D scanners that can scan real life (3D  ) objects, but these are extremely expensive, and used in the creation of movies like Lord of the Rings.
3D applications are different. You can create objects (or buy them, like for Poser) with the help of meshes, a mesh being a number of points in 3D space (your monitor plus imaginary depth) that are corner points of triangles, quadrangles or even n-gons (more angles). These you can "rig", meaning that you can, for example, make an arm move, animate, add textures and render. Rendering means creating a still, pixel-based image of your mesh. A sequence of these images can become an animation.

So in short: no, you cannot scan a picture of a car to become a 3D object, but if you have the application and the money, you can buy 3D cars that you can pose and render.