It activates with the wand and holding trigger, but that is just the demo setup, can just attach the gesture tracking component to anything (like the motion controller).
You’ll have to keep in mind that unless I specifically enabled mirror mode on a gesture, I am left handed so the starting direction of things is typically reversed from normal. Also the starting location matters, drawing the circle from bottom won’t match the circle drawn from top, it isn’t a glyph recognizer, it is a path recognizer.
Also I left all settings default for those example ones, tolerances can be adjusted to make gestures easier or harder to detect.