title: Module 'cv2.cv2' has no attribute 'ximgproc'
body: <p>I am trying to perform a selective search to an image using OpenCV but when I run my code I get this:</p>
  
  <pre><code>&gt;&gt;&gt; import cv2
  &gt;&gt;&gt; ss = cv2.ximgproc.segmentation.createSelectiveSearchSegmentation()
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  AttributeError: module 'cv2.cv2' has no attribute 'ximgproc'
  </code></pre>
  
  <p>I've seen similar problems but people solved them installing <code>opencv-contrib-python</code> package. I've already installed this module but the problem persists.</p>
  
  <p>Here is my requirements file:</p>
  
  <pre><code>opencv-contrib-python==4.1.0.25
  opencv-python==4.1.0.25
  </code></pre>
  
  <p>I am using a conda environment with python 3.7</p>