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How to set scan function to vedioplayback example in android

Hi  using vedio playback example i am able to play vedios,but i waht i want is ? when camera activated that time i need to set scan funtion and after few seconds if targeted images correct means i need to display vedio otherwise i need to display one alert dailog   "No Target Image Found" like that please any one suggest me how to display that alert msg and scan action to vedioplayback sample application

 

 

 

              Thankyou 

thankyou frnds all your responses is correct toast masg is displaying when target image is detected.but what i need is i  have to scan image some time(few seconds ) after that if targetd image is correct means i need to display that image related toast msgs like "chips" other wise