If your cable service is analog then you can split the coax cable and connect one end to the recorder and the other to the TV antenna input. Set the recorder to cable rather than air and see what channels you get. For playback you would connect the AV outputs to the TV
If it's digital cable then you would have to have a cable box with AV outputs to connect the recorder. It doesn't have a digital tuner for cable or over the air.
TVs don't have video outputs so you can record the tuner or roku apps that are internal to the TV.