You can use the figure handle (instead of the axis handle) with the getframe function and that captures the entire interior of the figure window, including the axes title. Here's an example:
filename = 'testVideo.avi';
fontSize = 14;
% Initialisation
hf = figure(); % hf - figure handle
[X,Y,Z] = peaks(100);
hp = surf(X,Y,Z); % hp - plot handle
% Ensure axis limits are fixed
ax = gca;
axis([-4 4 -4 4 -10 10])
ax.ZLimMode = 'manual';
v = VideoWriter(filename); % v - video writer object
open(v)
% Example of a video scaling the peaks function
C = [0:0.1:20 19.9:-0.1:0]./20;
for ii = 1:numel(C)
% update the figure title
title(sprintf('Z = %.2fZ_P',C(ii)),'fontSize',fontSize)
% update the plot
hp.ZData = C(ii)*Z;
f = getframe(hf); % getframe using the fig. handle, hf.
writeVideo(v,f) % write video
end
close(v)
