You can also try webcamoid which was recently suggested by a user. We will add some docs about it soon.
With AmCap, maybe your issue is just that you are grabbing in MJPEG, which by default will just show raw video with no processing. Make sure you select YUY2, we have some instructions and screenshots here:
The video modes that involve some processing in the camera use YUY2 or Greyscale outputs to the host computer.