In the video, a person is seen using a black marker to fill in a letter on a piece of fabric. The fabric is stretched tightly over a circular frame, and the person's hand is visible as they carefully color within the lines of the letter. The marker appears to be a thick-tipped permanent marker, and the person is using it to fill in the letter with a solid black color. The fabric is white, and the letter being filled in is bold and black, making it stand out against the background. The person's movements are steady and precise, indicating that they are experienced in this type of work.