Thanks for your suggestion.
Yes, the video is showing an off-power soldering iron waving over the sensor. For this sensor, heat is not needed to have good tracking. We use soldering iron in the video because we want to show that even a very thin soldering iron can work with the sensor. Of course, human hand can even have better performance. We would later on have more demonstration by hand.
Although the maximum sensing distance is about 10cm, which may be similar to capacitive sensing, this sensor would not be affected by any electromagnetic interference. One great advantage is that you can perfectly use the sensor even if you are wearing gloves while capacitive sensing cannot. GestureR can track any object that is conductive or non-conductive.
Moreover to 2D tracking of object, GestureR can also track the depth of object smoothly. Finally, GestureR can measure the light intensity.