UE4 supports HTML5, where the software would run like an in-browser game. It downloads the data and runs it within the browser, so it requires the user’s system to be good enough to run it well, and to have a compatible browser.
It might not support multi-touch from within HTML5 though, so that could be an issue, but it doesn’t require anything special from you to get it working, you just upload it to your server.
The alternative is probably not something you can do, where it runs the app on a server and streams the interaction to the user–it would allow a user to use the app even if they have a weak computer, but requires a very robust server system or you get lag.
Doing a simple kiosk is very easy to do though.