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Currently; even without a Comcast 4K DVR, you should be able to use the built-in apps found on your television.
Use the You Tube app to view 4K videos. There is a 4K heading to click, and also typing "4K", "UHD", or "HDR", while find more offerings. You Tube is free. Typing in "You Tube Red" will find some sample offerings 4K episodes for a paid service. If you have high-speed Internet you can use the tv's remote to watch these apps directly over the Internet.