1.Get Them All Downloader
https://chrome.google.com/webstore/detail/getthemall-downloader/nbkekaeindpfpcoldfckljplboolgkfm?hl=en-US

Analyze webpage using built-in filters. Download pdf files, html, images, music, video.

• download Images: gif, png, ico, jpg, bmp
• download html files: html, css, js
• download archives (rar, zip, 7z, jar, tar), doc files(doc,xls,), exe and msi
• download video: mp4, avi, webm, 3gp, mov
  I haven't tried it, but it looks like what you want. It's also well-rated, and has more than 130,000 users.

or 2.Download Master.

https://chrome.google.com/webstore/detail/download-master/mcceagdollnkjlogmdckgjakjapmkdjf?hl=en-US
(With this extension you can download all images, videos, pdf, doc and any other file linked on the web page you are visiting.) There were some complaints though about crashes if too many links are on the page. It has over 320,000 users, but is rated a bit lower than Get Them All Downloader.

Now remember that to use a Chrome extension, all you need is the Opera extension, called, "Download Chrome Extension."
https://addons.opera.com/en/extensions/details/download-chrome-extension-9/?display=en