Emphasis map usage is demonstrated in Capture SDK 7.0 (https://developer.nvidia.com/capture-sdk). In the Capture SDK 7.0 package, this app will be in the SDK/samples/NvFBC/NvFBCDX9NVEnc directory
To explore the emphasis map feature, run the application with commandline switch: ‘-enableEmphasis’
The application help menu also describes this.
Follow the ‘m_bEnableEmphasisLevelMap’ variable in SDK/samples/NvFBC/NvFBCDX9NVEnc/Encoder.cpp to see how qpDeltaMap is used as emphasis map.