Is there value in posting a video of my paper presentation online? I am a PhD student in computer science and I have a paper accepted in a conference. One of my friends will record me presenting the paper during the conference and I was wondering if there are any benefits of uploading that video recording online for example on YouTube?
You need to be sure that you are allowed to record presentations—as one of the comments indicated, many conferences prohibit such behavior.

If you are allowed to do so, it's usually for personal purposes, and public postings may be limited.

On the other hand, it may be possible for you to create your own version of a "podcast" with the talk using screen capture software. You can talk through your slides in greater detail than is possible in a typical conference presentation.

That said, I don't think there will be a huge demand for such a presentation.