These videos are now available on YouTube, and individual links are provided on the elinux.org wiki page that keeps track of presentation materials as well. You can also find them all through the Embedded Linux Conference Europe 2015 playlist on YouTube.
All this is of course a priceless addition to the on-line slides. We hope these talks will incite you to participate to the next editions of the Embedded Linux Conference, like in San Diego in April, or in Berlin in October this year.
In particular, here are the videos from the presentations from Bootlin engineers.
Our CTO Thomas Petazzoni also gave a keynote (Linux kernel SoC mainlining: Some success factors), which was well attended. Unfortunately, like for some of the other keynotes, no video is available.