@Triopticon: Videos are taken in high resolution in AVI format. But that is huge. Like 100 Mb per second. So I must convert to MP4, and I do that also using high resolution. But Mp4 is just bad, lose all the quality, but the video is very small in size, which is the most important in such guide.
Delete objects is indeed trick. You must zoom in in the object. Perhaps I put something around that in the guide.
Thanks for the suggestions.