Insert videos in Google Slides from Google drive and YouTube.

Today, Google made it possible to insert videos in presentations from Google Drive and YouTube. After inserting the videos in Google Slides, users will have the option to choose when to start or end the video; whether the video should auto-play when presenting. Additionally, users will also have the option to mute or play the video with audio by doing right-click on the video and choosing Video options. 

Inserted videos can be played both on the web or a mobile device. However, inserting videos to Google Slides is only supported on the web. For those viewing the presentation and do not have permission to view the embedded video, can always request request access.