object detection - OpenCV GPU support and TBB -


i going train haar classifier flowers(which highly skeptical about). have been following codingrobin tut everything.
http://coding-robin.de/2013/07/22/train-your-own-opencv-haar-classifier.html

now, has been emphasized use gpu support, multithreading etc. otherwise training gonna take days. going use pre-built libraries , therefore pre-built opencv_traincascade utility.

i want ask beforehand, able leverage gpu support if use pre-built libs, given install cuda?
tbb fit in whole picture?
recommend me building whole library scratch tbb , cuda support checked, or waste?

note: using opencv 2.4.11. , complete beginner opencv.


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