The following applications give you a quick overview on which kind of problems you can solve with the optimal control library, you can find example code at the given links.
Optimization of vehicle dynamics, race track simulation, implementation of a predictive controller for autonomous driving. Have a look at the blog post about laptime optimization of a remote controlled race car , and the race car example code.
Optimization of aircraft and spacecraft flight trajectories, control of unmanned aerial vehicles. Have a look at the OpenAWE project which is about optimization of flight trajectories for airborne wind energy.
info [at] openocl.org