To input video to your PC you would need hardware known as a capture card with software to convert video and audio into compressed data and store them on the PC via a USB connection (as this is a laptop). The video output most commonly used is known as composite video and this is generally output from a VCR or Freeview box to the TV. Results are variable in terms of resolution which can be achieved as you are processing large amounts of data but Pinnacle among others make such products.
If you just want to record TV then a USB TV card such as those made by Freecom would be a better bet provided you can connect a strong aerial signal.
I use both the above for different things but for convenience and quality the second option wins hands down.