How to use this module?

This module doesn't provide a field widget. Also it doesn't do anything by itself, but other modules can use it. It seems for now only Media module uses it, So, install Media and go to "Content -> Media (it is a tab button in the upper right) -> Add file" to upload files.

However my question is, how can I use this module in my own module or use it in a Views header?

This module provides a filefield widget: http://drupal.org/sandbox/vingborg/1138512

For now, the D7 version only provides an API for adding a plupload form element to a form. It doesn't expose anything to the end user directly. Other modules can use the API to integrate the functionality into their workflows. This is documented on the project page in the "6.x vs. 7.x" section.

As per #1, Media module integrates it currently.

There's discussion on what end-user functionality would make sense to add to the plupload module itself in #880300: Decide on a plupload module roadmap, and an issue specifically about a bulk upload cck field in #1019170: D7 Bulk Upload File Field.

Thanks, effulgentsia. However I can't see anything useful on the project page in the "6.x vs. 7.x" section. There's only this: "So far, the 7.x version is completely different. You only need the 7.x version if another module tells you to download it."

What I would like to do is to embed the Plupload uploader in the header of a Views page and let the users with rights to upload multiple image entities, that are shown by the Views. As I understand to do this I need the Media module, as it describes file types, styles and file fields. So I guess that I can't embed directly the Plupload form, but I need to embed Media's upload form which encapsulates Plupload?

Any help or advise is more than welcome. I'm pretty stuck here...