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detect object of interest in an image using opencv

This question might come across as really generic, since I dont have much experience with opencv, so please pardon me. I am looking for a way to detect objects of interest in an image (not just faces, but any foreground) and get a bounding rectangle for all possible objects of interest in the image. Is there a way to do so using opencv? What modules should I be looking at? So far in my research, I have tried using Saliency API of opencv and some of the feature detection algorithms. They mostly work but they dont really pin point the bounding area of the object. Can I use its output and use some other algorithm to process that data and get a bounding rectangle of possible objects of interest?