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"I want to extract SIFT descriptor from my choosen points." - No, you don't choose the points yourself, instead leave it to SIFT:

Ptr<FeatureDetector> detector  = FeatureDetector::create( "SIFT" );
vector<KeyPoint> keypoints;
detector->detect( img, keypoints );

"I want to extract SIFT descriptor from my choosen points." - No, you don't can't choose the points yourself, instead leave it to SIFT:

Ptr<FeatureDetector> detector  = FeatureDetector::create( "SIFT" );
vector<KeyPoint> keypoints;
detector->detect( img, keypoints );