Add camera control example.
Add camera control example.

unrealcv/unrealcv,unrealcv/unrealcv,qiuwch/unrealcv,qiuwch/unrealcv,qiuwch/unrealcv,unrealcv/unrealcv,qiuwch/unrealcv,unrealcv/unrealcv,qiuwch/unrealcv,unrealcv/unrealcv,qiuwch/unrealcv