Improvements in tests, bugfix in digits_video sample

samples/python/digits_video.py

@@ -27,9 +27,12 @@ def main():
     if not os.path.exists(classifier_fn):
         print('"%s" not found, run digits.py first' % classifier_fn)
         return
-    model = SVM()
-    model.load(classifier_fn)
 
+    if True:
+        model = cv2.ml.SVM_load(classifier_fn)
+    else:
+        model = cv2.ml.SVM_create()
+        model.load_(classifier_fn) #Known bug: https://github.com/Itseez/opencv/issues/4969
 
     while True:
         ret, frame = cap.read()