We are going to make a new request as follows:

// SNIPP SNIPP
{
     "inputContent": "/9j/7QBEUGhvdG9zaG9...base64-encoded-video-content...fXNWzvDEeYxxxzj/Coa6Bax//Z",
     "features": ["LABEL_DETECTION"]
 }
// SNIPP SNIPP

Note that the inputContent property under the image property is the base64 encoded version of the video. In the same videos folder, you should find a file named Label_Detection-2018228-f88xrq785g_Base64.txt. This is the base64 version of the same video. You can use an online service such as https://www.browserling.com/tools/image-to-base64 or https://www.base64-image.de/ for converting your own video to base64 string. And, under features, we are requesting the LABEL_DETECTION feature.