Command on webcam side:
gst-launch-0.10 v4lsrc device=/dev/video0 ! ffmpegcolorspace ! ffenc_mpeg2video ! tcpclientsink host=localhost port=6666 protocol=GST_TCP_PROTOCOL_GDP

Command on the receiver:
gst-launch-0.10 tcpserversrc host=localhost port=6666 protocol=GST_TCP_PROTOCOL_GDP ! ffdec_mpeg2video ! ffmpegcolorspace ! ximagesink

Output on webcam side:
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
ERROR: from element /pipeline0/v4lsrc0: Internal data flow error.
Additional debug info:
gstbasesrc.c(1614): gst_base_src_loop (): /pipeline0/v4lsrc0:
streaming task paused, reason not-negotiated (-4)
Execution ended after 141560000 ns.
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
FREEING pipeline ...

On the receiver side:
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
<here it waits to for a connection>
ERROR: from element /pipeline0/tcpserversrc0: Could not read from resource.
Additional debug info:
gsttcpserversrc.c(306): gst_tcp_server_src_create (): /pipeline0/tcpserversrc0:
Could not read caps through GDP
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
FREEING pipeline ...