how to select track an object in a video..?

hello everyone. i m trying to devolpe an application with a user friendly gui to select an object like car person etc and track this object throughout the video. and i am a beginer on this plateform can anyone help me to cop with this.?? my quastions are here

problems

how much numbers of control should be there like browse a video clear or to select an object

how to import and play video on gui

and how to apply the algorithem so i can be able to track the object among of a video?