Yes, you can. Below is the standard method for setting up the ability
to display video a video signal, from a VCR, on the Macintosh monitor:
1) Assemble the VCR and cables you need to connect it to the Macintosh.
2) If the Macintosh and VCR are powered on, turn them off.
3) Plug one end of the single-RCA-plug cable into the Video Out socket on
the VCR.
4) Plug the other end of the single-RCA-plug cable into the composite input
port on the Macintosh.
5) Plug the dual-RCA-plug end of the other cable into the left and right Audio
Out sockets on the VCR.
6) Plug the stereo-miniplug end of this cable into the sound input port on the
Macintosh. You can use a Y-shaped adapter to convert a dual RCA-plug cable
to one that has a stereo miniplug at one end.)
7) Turn on the computer and the VCR.
8) Open the Apple Extras folder on your hard disk and locate the Video Monitor
application.
9) Double-click on the Video Monitor icon to launch the application. A black
window titled "Monitor" will appear.
10) Turn on the VCR and press the play button. A video image will appear
inside the monitor window.
Troubleshooting:
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If a video image does not appear, try the following:
1) Choose Source from the pop-up menu at the top left side of the Video window.
2) In the dialog box which appears, review the choices selected in the Input
and Format pop-up menus:
* The Input choices indicate the input port for the video device. The preset
choice is composite video, which is the standard for most VCRs.
* The Format choices indicate the format, or standard, of the video signal.
The preset choice is NTSC, which is used in the U.S. and Japan.
3) Make sure all of the cables are securely connected between the video device
and the computer.
4) Make sure the video device is turned on.