Here is a cross pendant you can wear to record video and capture audio covertly. Whether you want to capture more natural videos for YouTube or spy on someone, the Cross Spy Camera has you covered. The device has 8 GB of internal memory and can record for 3 hours on a full charge. It can record 640 x 480-pixel 30FPS VGA videos and 1280 x 960-pixel photos.
This camera might not outperform a regular camcorder. But it is very useful for recording videos discreetly. Not too expensive either.