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I have worked with both api from opencv to java and javaCV and I do recommend you to work with the api. Mainly because of the documentation. Also if you dont find examples exactly for the api use, you can easily read either the c++ or the python implementation and try to find out how in java. I have realised java implementation and python are very similar.
About the gui, you can use gui builder for java. And to display an image you can create a function where the input is the image to display. See http://answers.opencv.org/question/8119/how-to-display-image-on-java-release/?answer=32135#post-id-32135
