Hello. My name is Michael. I can help you with your qeustions.
This is a notification to you, and is there by design for "convenience". The vibrations is supposed to indicate that you have just taken a picture (even if you are in video recording mode) - just to let you know that you've done that. But if you are recording video and do not take an additional picture during the recording, it should not vibrate. If it does, or if you have it happening at a different time, please provide whatever specifics you can, and I will do my best to help.