Camera on MacBook Pro not working

Reinstalling the Microphone:

Is there a camera even seen? If not, you may need to go about reinstalling the macOS. If you removed the plugin somehow, then reinstalling it would be your only option.

Revealing the Microphone’s Connection:

Use this Link: Get System Information for your Mac - Apple Support

First off, see if the camera is even seen: 

1. Hold Down: the Option key
2. Click: the Apple menu
3. Choose: System Information or System Report
4. Select: Camera from the list on the left
5. Look For: any internal or external camera:

Links:

• Control Access to your Camera on Mac - Apple Support

• Use the Built-In Camera on Mac - Apple Support

• If your Built-In Camera isn't Working on your Mac - Apple Support

Jo O Said:

"Thanks for those ...... I have no problems with the microphone just the Camera. I shall try these later! I did see someone had tried opening with Chrome ? I feel a glitch catch needs to come out for 10.15.4 and 5 ?"

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Thank you for the Followup...

Copy & Paste Error:

Revealing the Camera's Connection

As for a supposed Glitch, report it. Go Here:

1. Go Here: Feedback - macOS - Apple
2. Select: "Bug Report" for "Feedback Type"
3. Select: "Software/Firmware Update" for the "Feedback Area"
4. Proceed: from there as Necessary

I don't see such issue. Might be there be an issue with app itself.

Did you tried facetime app and check if there you had such issue?