how to change webcam input to ipcam videoinput? i get errror in matlab program. i using ipcam app to display the video.

function varargout = myCameraGUI(varargin)
% MYCAMERAGUI MATLAB code for mycameragui.fig
% 

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @myCameraGUI_OpeningFcn, ...
                   'gui_OutputFcn',  @myCameraGUI_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT

% --- Executes just before mycameragui is made visible.
function myCameraGUI_OpeningFcn(hObject, eventdata, handles, varargin)

handles.output = hObject;
url=ipcam('http://10.30.120.226:4747/video/mjpg.cgi');

% framesAcquired = 0;
% frame = snapshot(url);
% im = image(zeros(size(frame), 'uint8'));
% preview(url, im);

handles.video = url;
% handles.video = videoinput('winvideo', 1);
%
% Update handles structure
guidata(hObject, handles);

% UIWAIT makes mycameragui wait for user response (see UIRESUME)
uiwait(handles.myCameraGUI);

% --- Outputs from this function are returned to the command line.
function varargout = myCameraGUI_OutputFcn(hObject, eventdata, handles)

% Get default command line output from handles structure
handles.output = hObject;
varargout{1} = handles.output;

% --- Executes on button press in startStopCamera.
function startStopCamera_Callback(hObject, eventdata, handles)

% Start/Stop Camera
if strcmp(get(handles.startStopCamera,'String'),'Start Camera')
    % Camera is off. Change button string and start camera.
    set(handles.startStopCamera,'String','Stop Camera')
start(handles.video)
    set(handles.startAcquisition,'Enable','on');
    set(handles.captureImage,'Enable','on');

else
    % Camera is on. Stop camera and change button string.
    set(handles.startStopCamera,'String','Start Camera')
    stop(handles.video)
    set(handles.startAcquisition,'Enable','off');
    set(handles.captureImage,'Enable','off');
end

% --- Executes on button press in captureImage.
function captureImage_Callback(hObject, eventdata, handles)
% hObject    handle to captureImage (see GCBO)

frame = get(get(handles.cameraAxes,'children'),'cdata'); % The current displayed frame
figure,imshow(frame);
%
folder = 'C:\Users\USER\Documents\FYP\GUI\Ripenesss_GUI\normal GUI_capture_3';  %the folder

     imwrite( frame, 'image.png');  %write the image there as tif
  % end

% --- Executes on button press in startAcquisition.
function startAcquisition_Callback(hObject, eventdata, handles)
ffb_ripeness_02;
%

function myCameraGUI_CloseRequestFcn(hObject, eventdata, handles)

delete(hObject);
delete(imaqfind);