custom path fly-through video

It would be great just to be able to have a scale-able circle you could add to the scene and a target, a bit like how the auto bounding box works. There are similar things in Maya, basically a follow path over x number of frames.

 That would allow quick turntables of models to output to video much much easier. A inverted option for interiors would work as well were the camera is static but the target is on the circle to look around.