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I'm also currently working on a project to detect various kind of things. If you are willing to invest time in tweaking the training process and get a lot of positive and negative image, yes it's a good technique. Don't forget that it detect object in a "almost fix position". For example, the face detector don't detect face that are not align perfectly with the webcam. So if you want to detect scissors in various angle, you will need to create at least classifier (xml) for at least the angles that will mostly be visible from the camera.

I'm not aware of any "out of the box" detection technique for scissors but you can always use your imagination and use some picture manipulation to extract a contour and recognise de shape or maybe some background suppression if the camera is not moving.

Have fun!