Missing constants from cv2 python interface (Bug #3181)

The video related constants (and possibly more), are missing from the cv2 python interface.

According to the docs:

http://docs.opencv.org/modules/highgui/doc/reading_and_writing_images_and_video.html#videocapture-get

The capture properties such as CV_CAP_PROP_FRAME_WIDTH should be available in the cv2 module, but they are not. They are only available through cv, or cv2.cv.

A snippet from a bpython session:

import cv2
import cv
cv2.VideoCapture(0).get(cv2.CV_CAP_PROP_FRAME_WIDTH)

Traceback (most recent call last):
File "<input>", line 1, in <module>
AttributeError: 'module' object has no attribute 'CV_CAP_PROP_FRAME_WIDTH'

cv2.VideoCapture(0).get(cv2.cv.CV_CAP_PROP_FRAME_WIDTH)

176.0

cv2.VideoCapture(0).get(cv.CV_CAP_PROP_FRAME_WIDTH)

176.0