So,you want to embed a video(movie) onto your blog.The process is very simple,even a dummie can do it.If you want to embed your original video,then first sign up for an account in youtube and upload your video and get the embed code.

Otherwise,you can easily embed any public youtube video in your blog.Go to youtube.com and search for the video.For example,if you want to embed a Barack Obhama video,search it and copy the embed code on to a windows notepad or anything else.
The following process is explained below with pictures for easy understanding.

1.Go to youtube.com and search for your required video

2.Copy the embeded code(ctrl+c) and paste(ctrl+v) it in windows notepad.

3.Sign in in to your blogger acoount and click the New Post button and next,select the option 'Edit html' as shown below and paste the html code as shown below.

4.Publish the post.That's it, as you can see now,the youtube video is embeded in your post properly.

NOTE:You can change the width and height of the video by replacing the values to your desirable ones.