How do I enable hardware accelerated video in VLC with Intel HD 4000 GPU?
VA-API (Hardware Acceleration For Intel )
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for Intel GPUs (for Intel HD Graphics as well as G45 and later):
sudo apt-get install i965-va-driver libva-intel-vaapi-driver vainfo
Configuration
VLC
Its in Tools > Preferences > Input & Codecs > Enable Use GPU Accelerated decoding
How to correctly enable/test VA-API on Intel Sandy Bridge?
vlc --ffmpeg-hw -v
Check the line
[0x7fd018c02d38] avcodec decoder: Using VA API version 0.32 for hardware decoding.