You're right about that first version was a bit sensitive. Some backend goodies are part of this version so false positive rates should've gone down. Try the new version and see if you feel any improvements.
Also, yes, camera is on all the time but you can turn of camera by clicking on Flutter icon and picking that option.
Lastly, this app runs entirely on local machine. It does not record or stream video data - it detects gestures locally in real time, so no video data ever leaves your machine.
Hope it helps!! :)