Hi,
This could be done easily using appdesigner. Type the following in command window:
>>appdesigner
This opens a canvas where we can start designing. Drag and drop two push buttons from common component library located on left side. In the right side of the window, the property inspector and callbacks of components are present. Add ButtonPushedFcn callback for both buttons and then shift to code view. You can write the corresponding code to play video in each of the callbacks.