It sounds like your question is less about video files and more about how to read a text file containing a list of filepaths to videos that you then want to use to create video reader objects. This should do the trick:
myFile = fopen('MyVideos.txt');
myVidPaths = textscan(myFile,'%s');
fclose(myFile);
for i = 1:numel(myVidPaths{1})
video(i) = VideoReader(myVidPaths{1}{i});
end
