Bux fix

Bug fix in the CreateVideoWriter secuence.
added new check_cameras() for windows and modified
show_and_select_camera() to delete not used cameras
added new check_cameras() for windows 
modified show_and_select_camera() to delete not used cameras
Merge pull request #2 from Tartarichi/camera

Added new check_cameras() for windows and modified show_and_select_camera() to delete not used cameras