Overlay path / trajectory in camera view (back and rear) for teleoperation mode

[elfutzi]

Teleoperation is sometimes hard when you don´t know where SEPP is going to according to a certain steering angle. Idea is to implement an overlay where you can see the path SEPP follows if you stay at this angle, like it is implemented in modern cars with cameras.

Don´t get me wrong... two lines in some color will do the job :)
I think the usage of the existing OpenCV (atm C++) pipeline is necessary.