I'm new to DSP and currently working on time-series data. The mentioned time series (of Toe) is extracted from a video tracking various body parts of an athlete. Ideally, there shouldn't be any movement in the signal and should stay around 0. I cannot explicitly make it zero, because, for other datasets, I'm not aware of what body parts are being tracked there; therefore, I need to do it in an implicit manner.
What are the noise removing techniques that can be used here? I used FFT transform, needless to mention it smoothened the signal.