I want to watch the video in this camcorder. I don't have a manual so how do I do that?

Check the manual to see exactly which lead you need, then look it up on Ebay.

If you have no manual you can download a manual for almost any equipment by Googling the make and model followed by the word Manual, then follow the appropriate link(s).

From Page 68 of your Manual:
1.- Open the jack cover.
2.- Connect your camcorder to the TV using the A / V cable supplied with your camcorder.

You may download a copy of the manual here.

I don't see any free manuals for this, but I did find one for sale here.
I have no affiliation with this source. I don't receive any compensation, whether you buy or not. Just wanted to let you know...

You can download the manual here. Disc Finalization begins on page 61.

You can view it HERE

I hope I helped you!

You can download the manual (and more) from the manufacturer's web site at
http://www.usa.canon.com/cusa/support/consumer/camcorders/minidv_camcorders/zr80#BrochuresAndManuals

Dear sir,
You can make videos by using iMovie software installed on your system.
Plug in virtually any digital camcorder and iMovie starts importing your video. Then iMovie helps you organize your video just as you organize photos: by putting everything in one central location and grouping video clips according the date they were taken. So it’s easy to find the clips you’re looking for — whether to watch or to edit. Don’t have a camcorder? You can still use iMovie: It displays video you captured on your still camera and imported into iPhoto.

have a nice day
good luck

Hello!

Here is a link to the manual.

Hope it will help you transfer the video.
https://manualsbrain.com/en/manuals/1046565/?page=56

To connect your camcorder to a TV (or VCR), you'll need audio/video cables. These need to be run from the VIDEO and AUDIO jacks on the camcorder to the VIDEO and AUDIO inputs on the TV (or VCR). Once cabling is completed, follow either of these scenarios: When connecting the camcorder directly to the TV, turn on the TV and tune it to the video input channel by pressing the INPUT button on your remote control. # When connecting the camcorder to a VCR that is already connected to a TV: Turn on the VCR and place it in the Line or Camera mode. # Operate the TV as you normally do to see the signal coming from the VCR. Select camcorders have an S-VIDEO jack, which offers higher video quality. Provided your TV or VCR has an S-VIDEO input jack, connect the camcorder to the TV or VCR using an S-VIDEO cable. Since the S-VIDEO cable only transfers video, you will also need to use an audio cable. Select the S-VIDEO input on your TV or VCR to view the signal coming from the camcorder.