to put image button on camera video streaming

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Hi, I'm in trouble with putting an image button on camera video streaming. I wanna put image button when face detected, but I cannot find solution or source code about that. First I thought just put Mat image on frame, but that is not button just image working with no function! How can I put an button on camera frame streaming? If you know about solution, please reply it... :( My execution environment is android 7.0.1, Nougat and API 25.