cann't show video by v4l2src

Hello Support-Team,
I want to show video used the follow command, I use CSI camera(more one)
gst-launch-1.0 v4l2src  device=/dev/video0! ‘video/x-raw(memory:NVMM),width=1920, height=1080, framerate=30/1, format=NV12’ ! xvimagessink
the errors was shown:
WARNING: erroneous pipeline:could not link v4l2src0 to xvimageslink0

I use nvgstcapture-1.0 to test, it’s ok.

Can you tell me the reason.