A small number of computer science conferences record videos of the talks. One I presented at was Massive Storage Systems
and Technology (MSST 2016) (although I don't think my video is available). The plenary-talk videos are available here.
For example, Workflow Specification for Large-Scale Computational Systems by David Montoya (with accompanying talk ...
I have hard time believing that you cannot find computer-related presentations on the web. Just google any relevant compsci terms.
If you want video, youtube has zillions, and TED talks https://www.ted.com/recommends has thousands more.
For plain slides, google I.e. "slideshow archives" - slideshare.net looks promising, there are more.