Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Capture
BODYCAPTURE_FILENAMEParameter: Body
BODYCAPTURE_BODY_LINKParameter: Add Body
BODYCAPTURE_BODY_ADDParameter: Pose
BODYCAPTURE_POSEParameter: Locked
BODYCAPTURE_LOCKEDParameter: Set Timeline to FrameCount
BODYCAPTURE_SETTIMELINEParameter: Set Neutral Frame
BODYCAPTURE_SETNEUTRALFRAMEParameter: Clear Neutral Frame
BODYCAPTURE_CLEARNEUTRALFRAMEParameter: Start Frame
BODYCAPTURE_STARTFRAMEParameter: Length
BODYCAPTURE_RANGELENGTHParameter: Root Rotation
BODYCAPTURE_ROTATIONParameter: Root Offset
BODYCAPTURE_OFFSETParameter: Camera
BODYCAPTURE_CAMERAParameter: Add Camera
BODYCAPTURE_ADDCAMERAParameter: Orientation
BODYCAPTURE_ORIENTATIONParameter: Bake
BODYCAPTURE_BAKEParameter: Position
BODYCAPTURE_MATRIX_BODY_POSITIONParameter: Rotation
BODYCAPTURE_MATRIX_BODY_ROTATIONParameter: Position
BODYCAPTURE_MATRIX_CAMERA_POSITIONParameter: Rotation
BODYCAPTURE_MATRIX_CAMERA_ROTATIONParameter: Position
BODYCAPTURE_MATRIX_NEUTRALFRAME_POSITIONParameter: Rotation
BODYCAPTURE_MATRIX_NEUTRALFRAME_ROTATION