If you mean file transfer, you can use standard protocols such as FTP or HTTP depending on the availability of these servers or you can send it over TCP/IP using socket as long as you create the server application yourself again using socket.
If you would like to send streaming video by following the standards, you will need to implement SIP/RTP/RTCP protocols or use ready made ones like below.
http://code.google.com/p/csipsimple/[
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http://www.linphone.org/[
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