How to use mfxExtVppAuxData

How to use mfxExtVppAuxData

mediasdk-man.pdf says:

Header.BufferId- Must be MFX_EXTBUFF_VPP_AUXDATA
SpatialComplexity- Spatial complexity that resulted from scene change detection
TemporalComplexity- Temporal complexity that resulted from scene change detection
SceneChangeRate- Scene change detection rate (0-255) that indicates the likelihood of scene change
RepeatedFrame- If true, indicates that the current frame repeated the previous one

I'm tring to attach this buffer to mfxVideoParam::ExtParam and put it to MFXVideoVPP_Init but I have
MFX_ERR_INVALID_VIDEO_PARAM result after call.

My question is How to use mfxExtVppAuxData structure?

Can somebody help me to understand this feature?

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