use opencv generic VideoCapture only

so that it works with video file or camera easily

Author: tobybreckon

capture_video.py

@@ -47,17 +47,7 @@
 
 # define video capture object
 
-try:
-    # to use a non-buffered camera stream (via a separate thread)
-
-    import camera_stream
-    cap = camera_stream.CameraVideoStream(use_tapi=False)
-
-except BaseException:
-    # if not then just use OpenCV default
-
-    print("INFO: camera_stream class not found - camera input may be buffered")
-    cap = cv2.VideoCapture()
+cap = cv2.VideoCapture()
 
 # define display window name