Lav Video Decoder

My laptop have intel hd graphics so I select intel hardware acceleration in lav decoder. but when any video which is unsupported in intel hw acceleration then it is played by sw acceleration. I think lav decoder must have secondary hw acceleration preference so I could able to select dxva as secondary

You should use DXVA2. That is fully compatible with your Intel GPU (and other brands as well). There is no advantage in using QuickSync.