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

async _renderMask() {
        this._maskInProgress = true;
        this._segmentationData = await this._bpModel.segmentPerson(this._inputVideoElement, {
            internalResolution: 'low', // resized to 0.25 times of the original resolution before inference
            maxDetections: 1, // max. number of person poses to detect per image
            segmentationThreshold: 0.7 // represents probability that a pixel belongs to a person
        });
        this._maskInProgress = false;
        bodyPix.drawBokehEffect(
            this._outputCanvasElement,
            this._inputVideoElement,
            this._segmentationData,
            7, // Constant for background blur, integer values between 0-20
            7 // Constant for edge blur, integer values between 0-20
        );
    }

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;
        }

        break;
      case 'partmap':
        const ctx = canvas.getContext('2d');
        const multiPersonPartSegmentation = await estimatePartSegmentation();
        const coloredPartImageData = bodyPix.toColoredPartMask(
            multiPersonPartSegmentation,
            partColorScales[guiState.partMap.colorScale]);

        const maskBlurAmount = 0;
        switch (guiState.partMap.effect) {