samples: video: Add TCP server sink sample

This samples captures frames from video capture device (in any format),
and sends them to its TCP client.

Tested with:
 - mimxrt1064 + MT9M114 video sensor.
 - Gstreamer 1.8.3 running on host

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>