No! Written language is formal; spoken language is casual. Reading a blog post sounds robotic. Use the blog as a structure, but speak naturally using the "key points" as a guide.
Usually, the video should be faster. People scan blogs, but they experience videos in real-time. Cut the fluff and focus on the "Aha!" moments that work best visually.
Put the blog link in the first line of the video description. In the blog post, embed the video near the top. This gives you two chances to rank on Google and YouTube for the same topic.