AI-Powered Product Demo Video Tool

I'm looking for an AI video creation tool specifically designed for generating marketing videos. The primary use of this tool will be to create product demonstration videos.

Key Features Needed:
- Voice-over narration
- On-screen text and graphics

Ideal Skills and Experience:
- Background in AI video generation
- Experience in creating marketing and product demo videos
- Ability to integrate voice-over and graphics seamlessly

Please share your portfolio and relevant experience.