If you have only one VIDEO camera you could move the camera from left to right on the same horizontal plane then input the results into StereoMovie maker.
Load the same file for both left and right eye sides then click the "forward one frame" button (located near the bottom of the window) for the left or right eye, check the results with your 3D glasses and adjust again if needed.
Sometimes it takes 3-5 clicks of the "forward one frame" button to get good depth, if you don't see any depth, reload the file for left & right again and click the forward button for the other eye this time.
If using a PHOTO camera just take the picture of the subject, then move the camera about 2.5 to 3 inches to the right (less for close subjects like flowers and more for far subjects like mountains).
Now you have a left and right picture that will show real depth when combined using StereoMovie Maker or StereoPhoto Maker!
I came here to chew bubblegum and to see 3D...and I'm all out of bubblegum!