Nvdcf tracker only support NVBUF_COLOR_FORMAT_NV12 color format

Please provide complete information as applicable to your setup.

• Hardware Platform (Jetson / GPU)
tesla v100
• DeepStream Version
5.0.1-20.09-triton
• JetPack Version (valid for Jetson only)
null
• TensorRT Version
7.0.0.11
• NVIDIA GPU Driver Version (valid for GPU only)
440.82
• Issue Type( questions, new requirements, bugs)
bugs
• How to reproduce the issue ? (This is for bugs. Including which sample app is using, the configuration files content, the command line used and other details for reproducing)
try to query nvdcf tracker as following:
NvMOTQuery query;
NvMOT_Query(mtrackerConfigFile.size(), const_cast<char *>(mtrackerConfigFile.c_str()), &query);

mtrackerConfigFile shows below:
[tracker]
tracker-width=640
tracker-height=384
ll-lib-file=/opt/nvidia/deepstream/deepstream-5.0/lib/libnvds_nvdcf.so
ll-config-file=tracker_config.yml
gpu-id=0
enable-batch-process=1

print the query info as following:
{computeConfig = 1 ‘\001’, numTransforms = 1 ‘\001’, colorFormats = {NVBUF_COLOR_FORMAT_NV12, 1431709388, 21845, 4294958992},
memType = NVBUF_MEM_CUDA_DEVICE, supportBatchProcessing = true, supportPastFrame = true}

I am confused with the colorFormats, as the Gst-nvtracker docs shows that the nvdcf tracker supports RGBA and NV12, but actually it only support NV12. so how to support the RGBA formats?
I am refering to DCF Tracker REFUSING to work while using low level library - #4 by moezruo6 and KLT NvMOT usage to test the nvdcf tracker. and got this:
!![Exception] [FAILED] Invalid color format
An exception occurred. [FAILED] Invalid color format
terminate called after throwing an instance of ‘std::exception’
what(): std::exception

• Requirement details( This is for new requirement. Including the module name-for which plugin or for which sample application, the function description)

Hey, you are using a standalone app to test nvdcf tracker lib, right? can you share me the repro for how to replicate your issue?