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If you stick to the stitching_detailed example you can actually replace the FeaturesFinder part with a detector + descriptor combination of your choice. Here's an excerpt:

Ptr<FeatureDetector> detector = 
    new PyramidAdaptedFeatureDetector(
        new DynamicAdaptedFeatureDetector(
            new FastAdjuster(20, true), 40, 60, 4),
        8
    );
Ptr<DescriptorExtractor> descriptor = DescriptorExtractor::create("ORB");

....

    (*detector).detect(img, features[i].keypoints);
    (*descriptor).compute(img, features[i].keypoints, features[i].descriptors);
    features[i].img_size = img.size();