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SK-AM69: Texas Instrument GStreamer Compatibility with Parallel Process

Part Number: SK-AM69
Other Parts Discussed in Thread: PROCESSOR-SDK-AM69A

Hello TI Engineers
First of all let me introduce myself, my name is Husein and I'm a software engineer from Indonesia and now I'm researching Texas Instruments SK-AM69 with Processor-SDK-AM69A.  

At this opportunity, I have several questions that I want to ask you, so I'm making a program for multi-channel camera streaming with a face detection and recognition task on it.
The overall process of the program is running like how we create Python programs and not based on GStreamer Pipeline, however I have succeeded in using GStreamer output pipeline only at the end of my program and only to display the result by converting cv2::Mat to Gst Buffer and it was on single channel camera program.
So my questions are: 
1. How can I run multi-channel camera streaming on the same connector and plane-id using GStreamer? Since the pre-processing, inference, and post-processing process of my code is not GStreamer pipeline based, and I only use GStreamer output pipeline at the end to display the result, and now I want to display all channel results in the same connector and plane-id. How can I display all the channels results only using the GStreamer output pipeline?

2. Because I need to create multi-channel program, I need to use parallel processing, and there are 2 mechanisms that I tried to implement, first is using "Multiprocessing" and the second is "Threading". I tried to run multi-channel camera and I want to display result from 1 channel, however GStreamer is not working and stuck when I use "Multiprocessing" parallel mechanism but somehow working on "Threading" mechanism and GStreamer is displaying the result from Threading and not from Multiprocessing. Do you have any idea why it can be like that? Is there any compatibility issue between Multiprocessing and GStreamer? Since the result from Multiprocessing is far better than Threading in my project cases. I really need to combine multiprocessing and GStreamer together, do you have any solution or any idea? 

Thank you so much for your time and I am looking forward to your reply.