I want to create a blog through which I can share the most popular and searchable YouTube videos. Please suggest me some software to use where I will be able to convert that video and use it for my blog.
What do you mean? you can get links for the youtube videos, but if you want to copy them, I use Fraps which allows you to record basically anything on your computer including youtube. But before buying it make sure it's what you want if you are going to get it.