export GST_PLUGIN_PATH=.:$GST_PLUGIN_PATH
export GST_DEBUG=*:4;
gst-launch-1.0 v4l2src device=/dev/video1 ! video/x-raw,width=800,height=600,framerate=30/1 ! videoconvert ! calib ! videoconvert ! fpsdisplaysink
gstreamer 加载filter 会递归的搜索GST_PLUGIN_PATH的所有子目录．
经过测试，在Ubuntu 16.04上，除了fpsdisplaysink，可显示的sink还有如下这么多:
autovideosink
gtksink
glimagesink
vaapisink
clutterautovideosink
aasink
cacasink
xvimagesink
ximagesink
waylandsink [weston]
intervideosink
fdsink
checksumsink
shmsink/shmsrc