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Play Vidoe without touch in AR Vuforia Sdk

I am working on AR project with Vuforia sdk and following VideoPlayBack sample project, i just want to play video without touch, I mean when marker detect then video will play. I am doing this when marker detect [videoPlayerHelper[touchedTarget] play:NO fromPosition:VIDEO_PLAYBACK_CURRENT_POSITION]; but it run video greater then marker size. I am getting confuse please help me on that this will be great help for me. Thanks in advance.