The specifics of your problem as suggested would be helpful, but you may want to try the following usual 'first' steps when an app is misbehaving:
First, open the multi-taskbar (double tap the home buttom or use multi-finger gesturing) - find the camera app, press and hold until the app jiggles, then press the minus sign which will close the app; return to the home screen and try again.
Second, if the above does not cure the issue, then 'Restart' and if not effective 'Reset' the iPad - directions HERE.
If none of these suggestions work, then please post back for further advice - good luck!
thanks. what happens is the following: the shutter usually does not open or when it does, it sometimes works for a few seconds and closes again. as it s a problem a friend of mine has, i will ask her to try your tip and let you know the result. the reset didn t work.