Ключевые слова: abstract, academic, academy, audience, auditorium, background, blurred, blurry, bokeh, business, center, cinema, classroom, college, colorful, concert, conference, convention, corporate, crowd, defocused, education, event, group, hall, international, lecture, meeting, motion, movie, nam, people, presentation, red, room, row, school, seminar, show, speaker, speech, stage, student, summit, symposium, talk, training, university, viet, workshop,