How to give custom Object to classifier in deepstream sample application-2 python

I am using DS-4.0.1, my concern is how to give custom object to classifier like I am using Primary Detector for object detection and from there I am getting b-box of person and bike so I am combining them and making single box as name as a bike-rider (on the basis of overlapping of box ), so I want to give that box(person+bike) to my custom train classifier which is trained for triplet using TLT. so how should i go so that i can give only bike-rider box to the classifier please help me out.

and how to draw custom b-box during detection on frames like person and bike as bike rider not 2 different different b-box.