How to use the @google-cloud/video-intelligence.v1.VideoIntelligenceServiceClient function in @google-cloud/video-intelligence

async function analyzeLabelsGCS(gcsUri) {
  // [START video_analyze_labels_gcs]
  // Imports the Google Cloud Video Intelligence library
  const video = require('@google-cloud/video-intelligence').v1;

  // Creates a client
  const client = new video.VideoIntelligenceServiceClient();

  /**
   * TODO(developer): Uncomment the following line before running the sample.
   */
  // const gcsUri = 'GCS URI of the video to analyze, e.g. gs://my-bucket/my-video.mp4';

  const request = {
    inputUri: gcsUri,
    features: ['LABEL_DETECTION'],
  };

  // Detects labels in a video
  const [operation] = await client.annotateVideo(request);
  console.log('Waiting for operation to complete...');
  const [operationResult] = await operation.promise();

async function analyzeShots(gcsUri) {
  // [START video_analyze_shots]
  // Imports the Google Cloud Video Intelligence library
  const video = require('@google-cloud/video-intelligence').v1;

  // Creates a client
  const client = new video.VideoIntelligenceServiceClient();

  /**
   * TODO(developer): Uncomment the following line before running the sample.
   */
  // const gcsUri = 'GCS URI of file to analyze, e.g. gs://my-bucket/my-video.mp4';

  const request = {
    inputUri: gcsUri,
    features: ['SHOT_CHANGE_DETECTION'],
  };

  // Detects camera shot changes
  const [operation] = await client.annotateVideo(request);
  console.log('Waiting for operation to complete...');
  const [operationResult] = await operation.promise();
  // Gets shot changes

async function analyzeLabelsLocal(path) {
  // [START video_analyze_labels]
  // Imports the Google Cloud Video Intelligence library + Node's fs library
  const video = require('@google-cloud/video-intelligence').v1;
  const fs = require('fs');
  const util = require('util');

  // Creates a client
  const client = new video.VideoIntelligenceServiceClient();

  /**
   * TODO(developer): Uncomment the following line before running the sample.
   */
  // const path = 'Local file to analyze, e.g. ./my-file.mp4';

  // Reads a local video file and converts it to base64
  const readFile = util.promisify(fs.readFile);
  const file = await readFile(path);
  const inputContent = file.toString('base64');

  // Constructs request
  const request = {
    inputContent: inputContent,
    features: ['LABEL_DETECTION'],
  };

async function analyzeSafeSearch(gcsUri) {
  // [START video_analyze_explicit_content]
  // Imports the Google Cloud Video Intelligence library
  const video = require('@google-cloud/video-intelligence').v1;

  // Creates a client
  const client = new video.VideoIntelligenceServiceClient();

  /**
   * TODO(developer): Uncomment the following line before running the sample.
   */
  // const gcsUri = 'GCS URI of video to analyze, e.g. gs://my-bucket/my-video.mp4';

  const request = {
    inputUri: gcsUri,
    features: ['EXPLICIT_CONTENT_DETECTION'],
  };

  // Human-readable likelihoods
  const likelihoods = [
    'UNKNOWN',
    'VERY_UNLIKELY',
    'UNLIKELY',