The author of this tutorial is Tatyana Fedorova. It was made with the AKVIS Sketch plugin in Adobe Photoshop, but you can take the standalone version of Sketch. The author also used the same image ("Orchid") in her tutorial for ArtWork (creating an oil painting).
Tatyana writes: "AKVIS plugins give one a fantastic opportunity to get a phenomenal mixture of art and photography multiplied by the power of the computer and the intelligence of software. For my first experience with AKVIS I choose the AKVIS Sketch and AKVIS ArtWork plug-ins. Everything is so quick and easy. Keep up your excellent work!"
Use the blue pencil (Effect Area Tool) to mark areas in the image that will remain unchanged. Use the green pencil (Blur Area Tool) to indicate the area to be blurred. Click on the button to process the photo with the new settings.