In the Pythonista interpreter, type:<pre>help('modules')</pre> to get a full list of all importable modules. Unfortunately there is no cv, cv2, opencv in that list.

If cv is in pypi (https://pypi.python.org/pypi) then you could try pipista (http://omz-software.com/pythonista/forums/discussion/119/pipista-2-0-bugs-in-pythonista-current-progress) but it only works with pure python modules. Please let us know if you have success.