How to add a marker on a plot which will move according to a for loop in MATLAB GUIDE GUI?

Hello, I have been trying to add a marker to my plot but I have failed so far. This is the piece of code I am working on:

v = evalin('base','a matrix in my workspace which is 1000 by 1');
plot(v, 'Parent', handles.axes2);
for frames = 2:handles.frameCount-1
    axes(handles.axes1);
    imshow(handles.videoStruct(frames).cdata);
    set(handles.text3, 'String', num2str(frames));
    drawnow;
    pause(1/handles.videoObject.FrameRate);
    axes(handles.axes2);
    hold on;
    plot(frames, v(frames), '.r');
end

I have two axes in my gui. axes1 is used to display a video and has no problems. "v" is plotted in axes 2 before the video display and I would like to add a marker to it which will "move" according to which frame the for loop is at.

The last plot(frames, v(frames)... line works but plots points on axes2.

I have 2 options:

1. Somehow delete the last marker plot when the loop moves to the next iteration. Actually I don't want to prefer this because I will implement a slider to control that marker in the future.

2. Any easier way to create a marker on a plot without plotting it over again :)

Thank you very much from now on...