There is a right and a wrong way to include video in your presentation.We see it happening all of the time; presenters using a video that they like without much thought of how it fits into the bigger picture. Don't let that be you.
Don't use video, for video's sake. YOU were asked to present, not to play videos. Use them to support your content, but not as a replacement for your words of wisdom.
Make sure the videos you select to play, are relevant to your presentation, align with what you are saying or are being used to illustrate a point. Be sure not to just push play and blindside the audience. Think of yourself as a movie star on a talk show, tee up the clip to the movie you are promoting, and provide the context.
Plan and practice your transition into the video, and what you will say at the video's conclusion. Reiterate the key points and takeaways. Remind the audience how that video fits into the puzzle and leads you to the next section of your presentation.
When considering the length of the video, pick out the relevant selection and play shorter clips. When the video is too long, you will lose your audience.