how to apply the intersect merge affect between a text box and a video ?

Hi Tasneem!

Happy to help!

We currently have a Merge Shapes feature request logged, so I'll include your voice in the report. We'll update this discussion as soon as we have news to share!

In the meantime, I found a related tutorial from Tom for creating a similar effect in Storyline. However, only with images.

Please let me know if you need anything else!