Grab video from webcam and stream it using udpsink via x264

gstreamer pipeline

Pipeline to send video (simulating SRC) get the data from video0
gst-launch-1.0 v4l2src device=/dev/video0 \
    ! decodebin \
    ! x264enc \
    ! rtph264pay \
    ! udpsink host=localhost port=5000

// if you are running it inside a docker container be aware of the host ip in udpsink
gst-launch-1.0 v4l2src device=/dev/video0 \
    ! decodebin \
    ! x264enc \
    ! rtph264pay \
    ! udpsink host=172.17.0.1 port=5000

Pipeline to crop a video and send data to UDP dest (simulating de VMS)
gst-launch-1.0 \
    udpsrc port=5000 caps = "application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, payload=(int)96" \
    ! rtph264depay \
    ! decodebin \
    ! videocrop top=200 left=100 right=4 bottom=0 \
    ! x264enc \
    ! rtph264pay \
    ! udpsink host=localhost port=5001
 
Pipeline to show video (simulating the application)
gst-launch-1.0 \
    udpsrc port=5001 caps = "application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, payload=(int)96" \
    ! rtph264depay \
    ! decodebin \
    ! videoconvert \
    ! autovideosink