How to use the @tensorflow-models/body-pix.toMask function in @tensorflow-models/body-pix

}

    // Begin monitoring code for frames per second
    stats.begin();

    const flipHorizontally = guiState.flipHorizontal;

    switch (guiState.estimate) {
      case 'segmentation':
        const multiPersonSegmentation = await estimateSegmentation();
        switch (guiState.segmentation.effect) {
          case 'mask':
            const ctx = canvas.getContext('2d');
            const foregroundColor = {r: 255, g: 255, b: 255, a: 255};
            const backgroundColor = {r: 0, g: 0, b: 0, a: 255};
            const mask = bodyPix.toMask(
                multiPersonSegmentation, foregroundColor, backgroundColor,
                true);

            bodyPix.drawMask(
                canvas, state.video, mask, guiState.segmentation.opacity,
                guiState.segmentation.maskBlurAmount, flipHorizontally);
            drawPoses(multiPersonSegmentation, flipHorizontally, ctx);
            break;
          case 'bokeh':
            bodyPix.drawBokehEffect(
                canvas, state.video, multiPersonSegmentation,
                +guiState.segmentation.backgroundBlurAmount,
                guiState.segmentation.edgeBlurAmount, flipHorizontally);
            break;
        }