title: Building OpenCV3.1.0 error: use of undeclared identifier 'selectROI'
body: <p>Building OpenCV 3.1.0 from Github.
  Which fails when it comes to compiling the <strong>tutorial example: features2D</strong>.</p>
  
  <p>First, it complaint it did not find <code>#include &lt;opencv2/tracking.hpp&gt;     //for ROI
  </code></p>
  
  <p>So, I added <code>video</code>: <code>#include &lt;opencv2/video/tracking.hpp&gt;     //for ROI
  </code>
  Solved the finding problem.</p>
  
  <p>Then complaint about <code>selectROI</code>: <code>cv::Rect2d uBox = selectROI(video_name, frame);</code></p>
  
  <p>From terminal:</p>
  
  <pre><code>[ 98%] Built target tutorial_objectDetection
  [ 98%] Built target tutorial_objectDetection2
  [ 98%] Building CXX object samples/cpp/CMakeFiles/tutorial_planar_tracking.dir/tutorial_code/features2D/AKAZE_tracking/planar_tracking.cpp.o
  /GitHub/opencv/samples/cpp/tutorial_code/features2D/AKAZE_tracking/planar_tracking.cpp:174:27: error: use of undeclared identifier
        'selectROI'
          cv::Rect2d uBox = selectROI(video_name, frame);
                            ^
  1 error generated.
  make[2]: *** [samples/cpp/CMakeFiles/tutorial_planar_tracking.dir/tutorial_code/features2D/AKAZE_tracking/planar_tracking.cpp.o] Error 1
  make[1]: *** [samples/cpp/CMakeFiles/tutorial_planar_tracking.dir/all] Error 2
  make: *** [all] Error 2
  </code></pre>
  
  <p>Any ideas on how to solve it?</p>
  
  <p>note: I would delete it all together, but it would be nice if I had it.</p>
  
  <p>And as you can see, fails on 98% -_-</p>