How do i get my video to playback? with-out taking the memory card out?

There is usually a physical switch where you move from viewing pictures/vidoes to taking pictures. Here there should be a setting for viewing. If not, then there usually is a menu option when you are viewing pictures/videos. Not sure which model of camera you are using, so I am not sure how to tell you specifically.

For Canon cameras, usually a menu button or function button. If you press this while viewing your photos, it should bring up a menu that has a play, stop, fast forward, erase, etc buttons on the screen.

Hope this helps. Good luck.