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Removing or replacing the background on the video occurs by processing each frame of the video. 1 second of video is 24 frames in each of which you need to remove the background (unnecessary objects, people, etc.) 

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Напишу, исправлю, доделаю функционал на php. Могу делать небольшие правки html, css. Работаю с "чистым " php и yii2.