I saw videos of people with covid-19 having tremors (shaking violently) in china. are tremors like that one of the symptoms of covid-19?

Chills: Tremors alone are not a commonly recognized symptom of Covid-19, however if you have a high fever and chills, the chills can be pretty severe (rigors) just like when you get a severe flu. Anytime there is high fever and chills there is usually shaking along with the chills. During an infection, the hypothalamus resets the body's core temperature setpoint to a higher degree, so you feel cold.