blacklist cv2 seem that the this is due to the difference betwee install name and package name...

navipy/scripts/check_blender_versions.py

@@ -26,7 +26,8 @@ packages = ['numpy',
             'statsmodels',
             'sklearn']
 blacklisted_package = ['PIL',
-                       'yaml']
+                       'yaml',
+                       'cv2', ]
 filereq = 'requirement_blender.txt'
 # Look for packages require by blender and navipy
 # there versions should match