Deepstream-test for stream?

Hello, NVIDIA developers.
I want to ask, can we use deepstream-test in use case for streaming from USB camera or v4l2 device?
Because in deepstream samples, we use deepstream-app to run v4l2 device.

Pls refer https://devtalk.nvidia.com/default/topic/1068279/deepstream-sdk/how-to-combine-python-and-deepstream-/post/5411588/#5411588