Set video position in videomixer

[bboyavatar]

Hello! I use "videomixer name=mixer sink_1::xpos=176 sink_1::ypos=144" to set
video position in pipeline, and it works well. How to write it in C codes as
"sink_%d::xpos" is not a propertity of videomixer? I try to use 
pad=gst_element_get_static_pad(mixer,"sink_1") to get the sink_1 pad, but
what to do next? 

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