Thumb problem

I did use a hand gestures template to make a filter but struggled with instruction on the site. 
I have changed the things in the hand gestures script and modified all victory gestures-related objects with —  thumb_gesture_trigger —  in the custom trigger and I thought it should work well.
Show victory interaction on thumb trigger. 
But it doesn't work. 
The second question is the idea how to change the background on hand interaction. Thank you for all the tips.