In the video, we see a group of children playing with a large structure made of colorful building blocks. The structure is quite tall and appears to be a fort or castle of some sort. The children are seen throwing balls at the structure, with some balls bouncing off and others hitting the structure and falling to the ground. The balls are of various colors, including green, red, and blue. The children seem to be having a great time playing this game, and the structure seems to be quite sturdy, withstanding the impact of the balls. The video captures the joy and excitement of the children as they engage in this playful activity.