This is the pipeline I’ve come up with on my Ubuntu Trusty GNU/Linux system. Of course, it can be customized with the device name/width/height/framerate of your choice:

gst-launch-1.0 v4l2src device=/dev/v4l/by-id/usb-INOGENI_1132-INOGENI_4K2USB3_01C31132-video-index0 ! video/x-raw,width=1920,height=1080,framerate=60/1 ! autovideosink pulsesrc device=alsa_input.usb-INOGENI_1132-INOGENI_4K2USB3_01C31132-03-D4K2USB3.analog-stereo ! autoaudiosink