Use hw accelerated scaling of image from v4l2src?

Hi,
The case is no supported:

... ! video/x-raw ! nvvidconv ! video/x-raw ! ...

Please run like:

... ! video/x-raw ! nvvidconv ! 'video/x-raw(memory:NVMM)' ! nvvidconv ! video/x-raw ! ...

You may customize nvv4l2camerasrc to have captured frames in video/x-raw(memory:NVMM) buffers directly. Please take a look at
Macrosilicon USB - #5 by DaneLLL