Wow that's neat! Have no input but here's a bump for you.
Welcome to the forum!
Here's a lovely video that shows you how to achieve that technique (look at the the video at the 2 minute mark). The pastry chef is probably using a Wilton tip 104. Here is a link to the Wilton petal tips that shows you different sizes of that same shape:
Wilton Petal Tips
You need a curved petal tip for this look. Not difficult.
Thank you for all the replies. That video was amazing. I searched all over You Tube but couldn't come up with the flower name.
Thanks again for the responses, everyone here is so nice and helpful! =)
You are very welcome. Go forth and create beautiful flower cupcakes!