Live Video processing and analysing

mov=aviread('mov.avi');
mov1 = 'mov.avi';

fileinfo = aviinfo(mov1);
for x = 1:fileinfo.NumFrames
[im1,map] = frame2im(mov(x));

imshow(im1);
pause(1);

startpos_E = 74.963269;
startpos_N = 32.732582;
endpos_E = 75.357845;
endpos_N = 33.075700;

[a b c] = size(im1);
disp (a);
disp (b);

   [x,y] = ginput(1);

           disp (x); disp (y);
            lon1 = startpos_E + ((endpos_E - startpos_E)*y)/b;
            lat1 = startpos_N + ((endpos_N - startpos_N)*(a-x))/a;

            [x,y] = ginput(1);

           disp (x); disp (y);
            lon2 = startpos_E + ((endpos_E - startpos_E)*y)/b;
            lat2 = startpos_N + ((endpos_N - startpos_N)*(a-x))/a;

                 fid = fopen('text.txt', 'wt');

    fprintf(fid,'\n Pixel position is %i & %i',x,y);            

   fprintf(fid,'\n %i E    ',lon1);
   fprintf(fid,'%i N',lat1);
   fprintf(fid,'\n %i E    ',lon2);
   fprintf(fid,'%i N',lat2); 

            if abs(lat1)>90 | abs(lat2)>90
      error('Input latitudes must be between -90 and 90 degrees, inclusive.')
       end

a = 6378137;
b = 6356752.31424518; 

lat1 = lat1 * 0.0174532925199433;
lon1 = lon1 * 0.0174532925199433;
lat2 = lat2 * 0.0174532925199433;
lon2 = lon2 * 0.0174532925199433;

if abs(pi/2-abs(lat1)) < 1e-10;
    lat1 = sign(lat1)*(pi/2-(1e-10));
end
if abs(pi/2-abs(lat2)) < 1e-10;
    lat2 = sign(lat2)*(pi/2-(1e-10));
end
f = (a-b)/a;
U1 = atan((1-f)*tan(lat1));
U2 = atan((1-f)*tan(lat2));
lon1 = mod(lon1,2*pi);
lon2 = mod(lon2,2*pi);
L = abs(lon2-lon1);
if L > pi
    L = 2*pi - L;
end
lambda = L;
lambdaold = 0;
itercount = 0;
while ~itercount | abs(lambda-lambdaold) > 1e-12
    itercount = itercount+1;
    if itercount > 50
        warning('Points are essentially antipodal. Precision may be reduced slightly.');
        lambda = pi;
        break
    end
    lambdaold = lambda;
    sinsigma = sqrt((cos(U2)*sin(lambda))^2+(cos(U1)*...
        sin(U2)-sin(U1)*cos(U2)*cos(lambda))^2);
    cossigma = sin(U1)*sin(U2)+cos(U1)*cos(U2)*cos(lambda);
    sigma = atan2(sinsigma,cossigma);
    alpha = asin(cos(U1)*cos(U2)*sin(lambda)/sin(sigma));
    cos2sigmam = cos(sigma)-2*sin(U1)*sin(U2)/cos(alpha)^2;
    C = f/16*cos(alpha)^2*(4+f*(4-3*cos(alpha)^2));
    lambda = L+(1-C)*f*sin(alpha)*(sigma+C*sin(sigma)*...
        (cos2sigmam+C*cos(sigma)*(-1+2*cos2sigmam^2)));

      if lambda > pi
          warning('Points are essentially antipodal. Precision may be reduced slightly.');
          lambda = pi;
          break
      end
  end
  u2 = cos(alpha)^2*(a^2-b^2)/b^2;
  A = 1+u2/16384*(4096+u2*(-768+u2*(320-175*u2)));
  B = u2/1024*(256+u2*(-128+u2*(74-47*u2)));
  deltasigma = B*sin(sigma)*(cos2sigmam+B/4*(cos(sigma)*(-1+2*cos2sigmam^2)...
      -B/6*cos2sigmam*(-3+4*sin(sigma)^2)*(-3+4*cos2sigmam^2)));
  s = b*A*(sigma-deltasigma); 

fprintf(fid,'\n distance is   %i m', s);
fclose(fid);
winopen('text.txt')
          end

[Baiju EP]

The above code is used for analying 3 videos. Now i want to cahnge the static video into web cam inputs. how can i do this