Okay, first of all, put all your camera settings to manual. Focus, exposure, everything. Having settings on auto causes flickering.
Are you pressing a button on the camera to take the picture? That causes camera bumps. You need to get a remote. It's important not to touch your camera at all while filming, or else you get camera bumps. The only time you should move your camera is when you want to do a moving camera shot. It could be possible that you have a flimsy tripod. You could get a webcam and some frame capture software to go with it.
The animation is very choppy. Try taking more frames. Do you have any idea how many pictures make up one second of your video? Most of us here use 15 fps (frames per second, picture=frame) Also , don't spin the minfig's hands around, it looks too unrealistic.
With lighting, you should be using at least 3 lamps. One above the minfig, one shining at the minifig, one pointing at the background. Don't use sunlight. The sun moves and clouds pass over it, making it inconsistent. That causes light flicker. Animate at night or cover the windows with black cloth so no light gets in.
One more thing, don't use the green baseplate as background. If you wanted a front yard set, you should build a Lego house on a green baseplate. Then, put some trees behind the house so the edge of the baseplate is covered. Put a big piece of blue paper behind that for sky.
Not literally dead, just no longer interested in Lego or animation.