The only thing you need is a package of "Bendaroos" or "Wikki Stix".
First, you take two of the sticks and twist the ends together on one side. Make sure they are stuck together well. Then, you need to loop it around your camera focus ring (the thing that you twist in order to focus the camera). Twist the two remaining ends together in order to form a little bar sticking out. Now, you can try it out! Mine is working perfectly and I can make little indentations where I need to keep the focus in a video.
Hope you enjoyed!
