OpenCV VideoCapture


- member variable is all protect → use method
- constructor → open()



# open


- constructor(name, video api)
> - constructor(0) means construct and open default camera
- bool open (index, camera api) 
> - index = camera_id + domain_offset_id
- bool isOpend() const



# Realese


- realese() - called by destructor
- read() == >> do same  - from first frame (grab() +  retrieve())
- int var = cvRound(double get(videocapture property id))
- bool set(prop id, double)






