For demonstration in the video was shown this 6-petals flower made of variegated yarn

The 3D petals of the flower are clear visible by the front side of the work.

You should begin the work from making round element, learn to crochet this puffy little round element in tutorial 7 of the crochet elements and projects. Continue:

By the end of the tutorial, you will get amazing 3D petals flower. Crochet 3d petal flower was made with yarn: Angora: 10% wool, 80% acrylic 10% mohair and crochet hook 2 mm or 2,5 mm.