Hey is It possible that I can change Face in Video also Like in Photograph

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Hey Freinds well I am about to learn Photoshope and I know that through Photoshope I can change face in Photographs and I can merge two face and make new face but I am curious that is there any cource or software that I can chage face in Video also suppose if In a video there is Tom cruis and I want to change his face and wanna see another actor in same video so is it possible plz tell me hows does it possible? and which cource I should learn