server
{
	listen 80;
	listen [::]:80;
	server_name msv-buehl-moos.de www.msv-buehl-moos.de;
	return 301 https://$host$request_uri;
}

server
{
	server_name msv-buehl-moos.de www.msv-buehl-moos.de;
	listen 443 ssl;
	listen [::]:443 ssl;
	add_header Strict-Transport-Security max-age=31536000;
	ssl_certificate /etc/letsencrypt/live/msv-buehl-moos.de/fullchain.pem;
	ssl_certificate_key /etc/letsencrypt/live/msv-buehl-moos.de/privkey.pem;

	location /
	{
		client_max_body_size 10G;
		proxy_buffering off;
		proxy_pass http://127.0.0.1:27964;
		proxy_set_header Accept-Encoding "";
		proxy_set_header Host $host;
		proxy_set_header X-Real-IP $remote_addr;
		proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
		proxy_set_header X-Forwarded-Proto $scheme;
	}

	# Serve /webcam/data/camera/ from the FTPS current folder
	location /webcam/data/camera/
	{
		alias /home/dockeruser/ftps_server/files/current/;
		autoindex on;
	}

	# Generic /webcam location for the rest of the content
	location /webcam
	{
		root /var/www/html/msv-buehl-moos.de;
		index index.html;
	}
}

Test config with nginx -t
Restart nginx with systemctl restart nginx.service