If you mean adding audio to a question, yes, you can do that. Open your question, and above the input section where you write your question, you’ll see “Add Media”.
Click on it and select the audio you want to include.
If you mean you want the quiz taker to speed up the video to watch it quickly, then, at the moment, unfortunately, there is no such feature available for usage.
If I understand your request incorrectly, please correct me and clarify the result you want to achieve so that we can guide you accordingly.