title: Can I build only the Opencv_contrib extra modules with prebuilt libraries of OpenCV 3.0.0?
body: <p>I am using opencv 3.0.0 libraries for an object tracking project for which I need the SURF class functions and interfaces. 
  I recently learnt that it is now in the opencv_contrib module that needs to be added to the opencv libraries. I have the following questions:</p>
  
  <p>1) Is it possible to build only this module into my existing opencv libraries that I extracted using the opencv.exe downloaded directly form their website (I did not build it using CMake the first time)</p>
  
  <p>2) Is it ok to rebuild the entire opencv3.0.0 library with the extra modules and to keep the pre-built libraries in seperate directories? </p>
  
  <p>3) If (2) is not possible, is there a way to erase all the opencv 3.0.0 library files and start fresh with extra modules included?</p>
  
  <p>I am very new to this and I am using OpenCV to complete an assignment on object tracking.</p>