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To train a powerful cascade and you can take a look here for a lot of tricks about hyper-speed haar, hog, lbp cascades: http://www.vision-ary.net/2015/03/largest-boosted-cascades-opencv-lbp-haar-hog/
Using 1000 samples is very naive (academic approach), the expert team above uses something like 7-12k positive samples and billions of negative samples with days of training!
Regards!