[Libav-user] How to decode video in libav via video acceleration using vaapi

[Safi]

Hello i have developed a working media player using libav for my project 
. now i want to decode my h264 video using video acceleration decoding 
via vaapi and libav libaries but i have very little idea on how to do 
that . could someone guide me on how to do it and where could i get at 
least some examples on how this is done