As mentioned in the video, all of the responses to your questions are collected in a spreadsheet that you can download and or open in Google Sheets. Once the responses are in Google Sheets you could use the Flubaroo Add-on to grade the responses to your quiz.
Applications for Education
Vizia could be a good tool to use to create short flipped video lessons in which you ask questions to check for understanding. One way that I might use it is to put a campaign commercial into the Vizia editor then create questions that ask students to identify the persuasion techniques that are used in the commercial.