Add watermark image with NodeJs and ffmpeg

watermark.js

var ffmpeg = require('ffmpeg');

try {
  var process = new ffmpeg('mymovie.mp4');
  process.then(function (video) {
    console.log('Video is ready to be processed');
    var watermarkPath = 'watermark.png',
      newFilepath = './newVideoFileName.mp4',
      settings = {
          position        : "SE"      // Position: NE NC NW SE SC SW C CE CW
        , margin_nord     : null      // Margin nord
        , margin_sud      : null      // Margin sud
        , margin_east     : null      // Margin east
        , margin_west     : null      // Margin west
      };
    var callback = function (error, files) {
      if(error){
        console.log('ERROR: ', error);
      }
      else{
        console.log('TERMINOU', files);
      }
    }
    //add watermark Function
    video.fnAddWatermark(watermarkPath, newFilepath, settings, callback)

  }, function (err) {
    console.log('Error: ' + err);
  });
} catch (err) {
  console.log(err);
}