In the video, a person is seen applying a clear nail extension to their fingernail. The person takes a small piece of the extension and places it on the tip of their nail. They then use a tool to smooth out the extension, making sure it is even and fits properly. The person repeats this process for each nail, carefully applying and smoothing out the extensions to achieve a natural and polished look. The video provides a clear demonstration of how to apply nail extensions, highlighting the importance of precision and attention to detail.