For optimal results set the camera vertical FOV data in:
YOUR_PROJECT_PATH\Binaries\Win64\mediapipe\graphs\face_mesh\multi_face_landmarks.pbtxt
node { calculator: "FaceGeometryEnvGeneratorCalculator" output_side_packet: "ENVIRONMENT:environment" node_options: { [type.googleapis.com/mediapipe.FaceGeometryEnvGeneratorCalculatorOptions] { environment: { origin_point_location: TOP_LEFT_CORNER perspective_camera: { vertical_fov_degrees: 59.0 near: 1.0 # 1cm far: 10000.0 # 100m } } } } }