There is no update from you for a period, assuming this is not an issue anymore. Hence we are closing this topic. If need further support, please open a new one. Thanks
nvmultiurisrcbin plugin is developed for the REST API server support. DeepStream With REST API Sever (Alpha) — DeepStream 6.2 Release documentation
The REST API server is only alpha version and supported only on x86. Please read page 3 of DeepStream SDK 6.2 for NVIDIA dGPU/X86 and Jetson