There is no connected camera

Sorry, it's not hardware. Spent hours trying to resolve this issue and being told to reset xy&z doesn't work - neither does safe mode/new account... check this is a parallel discussion on the issue: https://discussions.apple.com/thread/251186757?answerId=252724128022

This issue is well know to Apple: last update 10.15.5 includes" Resolves an issue where the built-in camera may not be detected when trying to use it after using a video conferencing app" but it's far from resolved.

It's affecting built-in cameras on both new and old MBPs, as well as 3rd party webcams. It appeared with the intro of Catalina, and right now, if you have a Mac that has 'lost camera', forget video conferencing at the moment. There is nothing wrong with your USB ports - for sure all work perfectly with anything else plugged in, and there is nothing wrong with the external cameras - bet they work fine on Windows and anything pre Catalina!

I have 4 minis, server, 2 IPh11 +++ / Mbp 2012+2015 / 3 ipads / 5 windows10pcs +++ on my network ... and have been an apple customer for over 30 years. I've given up trying to fix it, now checking discussions so you don't waste your time!

My fix - thanks to link above, duped my mpbs back into Mojave, time machined them to feb - before the issue started to become apparent - have current work on minis, on network, so can access on mbp. It's ugly,but it works

The camera has to be recognized by the System— if not you have a hardware failure.

>(Option key) System Information>Hardware>Camera

something similar to:

If no hardware take it in for service

In or out of warranty you can get a free over the counter 'Apple Service Diagnostics' test /assessment

Make an appointment for a "hardware issue"—

https://www.apple.com/retail/geniusbar/

Outside the USA

https://locate.apple.com/country

From iOS device using the app to make a online Genius Bar appointment is easy:

https://itunes.apple.com/us/app/apple-support/id1130498044?mt=8

(note: due to the temporary closure of Apple Stores and the staggered reopening there may be some delays.

ref: https://www.apple.com/shop/browse/store/temporary_closures )

Call (800) MY–APPLE (800–692–7753)

or on line https://getsupport.apple.com/

or call AppleCare Support at 1-800-APLCARE.

Computer components fail, fact of life. Could be the Camera, the cable, the cable connection, or software bug.

Yes Apple can repair—

In or out of warranty you can get a free over the counter 'Apple Service Diagnostics' test /assessment and let them tell you if it is truly hardware or a software glitch macOS bug related.

Make an appointment for a "hardware issue"—

https://www.apple.com/retail/geniusbar/

Outside the USA

https://locate.apple.com/country

From iOS device using the app to make a online Genius Bar appointment is easy:

https://itunes.apple.com/us/app/apple-support/id1130498044?mt=8

(note: due to the temporary closure of Apple Stores and the staggered reopening there may be some delays.

ref: https://www.apple.com/shop/browse/store/temporary_closures )

Call (800) MY–APPLE (800–692–7753)

or on line https://getsupport.apple.com/

or call AppleCare Support at 1-800-APLCARE.

Hi,

I'm having same problem. I did a lot of things, including installed the same Catalina version 10.15.4.

I found a lot of people say the same problem too.

https://discussions.apple.com/thread/251252983

https://discussions.apple.com/thread/251272380

https://discussions.apple.com/thread/251222774

https://discussions.apple.com/thread/251194697

https://discussions.apple.com/thread/251200984

https://www.reddit.com/r/applehelp/comments/fqp3zy/2016_macbook_pro_camera_stopped_working/

If you have not already done so, soon SMC reset:

How to reset the SMC of your Mac - Apple Support

Note that the keys are called out by their locations. The keys with the same labels on the other side of the keyboard will NOT do the job.

.

It certainly looks that way. Complaints regarding that problem began shortly after the most recent macOS update, a week or two ago.

I suggest you Contact Support and let them know. It's nearly certain they will have you perform some menial tasks, so humor them and comply with their requests. They may even collect some data from your Mac, if you are willing to let them do that. On very rare occasions Apple will admit they know about a problem and are working on a fix. Don't expect that kind of response, or any indication of when or even if it will be fixed.

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Please note that it is impossible to conclude the camera stopped working as a result of the macOS update as I have surmised, for the simple reason that it coincided with a period of time in which people have been required to work and study from home. Is it possible that exponential increase in use correlated to an inordinately high number of hardware failures? Yes, absolutely.

My camera is having the same issue. I have already tried everything already mentioned with no resolution. I created a test account (not signed in with Apple ID) and the camera works normally on photo booth, so it does not appear to be a hardware issue.

How can I fix this ?

I suspect it's something Apple needs to fix. Please read Camera not detected MacBook Pro among many reports similar to yours.