1. Add your compressed .mp4 video to RapidWeaver > View > Show Resources.
2. In the Inspector > General > Slogan, enable this field.
3. Paste the autoplay video snippet:
<video autoplay playsinline muted loop="true" width="1280" height="720"><source type="video/mp4" src="%resource()%"></video>
4. Add your video filename within the resource () brackets.