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What you see there are feature point object detection applications existing of

• A feature detector : looking for interesting points in the image
• A feature descriptor : creating a unique point for that image
• A feature matcher, trying to find identical features in two feature sets and couple them

Look at this link, which describes feature point functionality in OpenCV: http://docs.opencv.org/modules/features2d/doc/features2d.html

And try to go through the following tutorials:

• http://docs.opencv.org/doc/tutorials/features2d/feature_detection/feature_detection.html#feature-detection
• http://docs.opencv.org/doc/tutorials/features2d/feature_description/feature_description.html#feature-description
• http://docs.opencv.org/doc/tutorials/features2d/feature_flann_matcher/feature_flann_matcher.html#feature-flann-matcher
• http://docs.opencv.org/doc/tutorials/features2d/detection_of_planar_objects/detection_of_planar_objects.html#detectionofplanarobjects