Macbook pro ‘There is no connected camera’ problem.

Hi

I’ve been struggled with this camera’s problem since last week.

things i’ve tried and none of it worked :(

1.restart the computer

2.relaunch all the apps i need camera to work

3.the terminal thing ‘sudo killall vdcassistant’

4.safe mode

5.diagnosis

6.control+alt+shift and launch the computer

7.control+option+p+r then launch the computer

8.the disk utility thing

9.updated into catalina 10.15.4

literally tried everything that i could find on this internet and nothing worked. Im depressed plz help.