Static kCVImageBufferRegionOfInterestKey 

pub unsafe static kCVImageBufferRegionOfInterestKey: &'static CFString

Available on crate feature CVImageBuffer only.

Specifies region of interest that image statistics cover.

This value should be a CGRect dictionary created by CGRectCreateDictionaryRepresentation(). The origin in the CGRect represents the x,y coordinate within the CVPixelBuffer where region of interest is located.

See also Apple’s documentation