Which part i need to put implay()?

hObject, eventdata, handles, varargin

[Geoff Hayes]

Shahmeer - please clarify how you want to use implay. Are you expecting the user to select a file and then press a button on your GUI that will launch this video viewer?

[Shahmeer Rosli]

Yes

Answer 1

[Walter Roberson]

   [file, filepath] = uigetfile('Select a file');
   filename = fullfile(filepath, file);
   implay(filename)

Answer 2

[Image Analyst]

You don't use any of those. implay() opens the Video Viewer app. You can use Video Viewer to show MATLAB® movies, videos, or image sequences (also called image stacks). So just pass it one of those. See the help for implay().