How to watch a video from one memory card on any camera?

The camera is not a viewing device. Watch the video through any computer.

Technically it is possible to take the video from the card one in a pc and convert it to the format and resolution and sound sample rate in which your camera takes video.

Then take tge card out of your camera and paste the video in the video folder(the folder where recorded videos are stored).If still not played you will have to take the card and rename the video according to the naming algorhythm of tge camera.

If still not played you have only one option left to play the video in a tv or pc and record it.Some camera support recording played video through wired connection.(av cables).

But all these process is not really worth the effort I guess.

Put your card into the camera.. If it gives you the option to view than watch if not than its not possible on your camera... SIMPLE...