How to use KAZE features in opencv ?

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A simple Google search would tell how.

Edit: Okay, that link directs you to AKAZE, which is not KAZE however initialized and used more or less the same way. Look at how that AKAZE example was used, and keep this docs of KAZE which would tell you what functions you need to replace, then you can achieve what you want. Let me also give you the docs for AKAZE so that you can compare the functions.