First off, make sure you practice your presentation and speech ahead of time. Speak slowly and carefully. Avoid talking too quickly even if you get nervous. Take a deep breath and remember that these are just people. Even though they may be important people, it doesn't mean you should be scared. Nervousness and fear will detract from your presentation.
Next, your visual aids should be a strong part of your presentation. Consider taking video editing courses if you aren't sure how to implement video or Power Point slides into your speech. This will give your viewers a chance to follow along, recognize key points, and even take notes if they need to. Additionally, sometimes video effects and pictures can add to your presentation by showing your audience an actual image of what you're trying to convey.