Ключевые слова: abstract, attention, audience, background, blogger, blur, blurred, boardroom, bokeh, business, center, classroom, conference, convention, cooperate, corporate, design, education, event, group, hall, indoor, join, learning, lecture, light, material, media, meeting, mobile, motion, movement, people, phone, presentation, projector, recording, room, screen, seminar, sitting, social, speaker, speech, student, study, teacher, train, video, vlogging,