Porting ESP32 CameraWebServer example to https - https

Question

I am trying to run the Arduino-ESP32 CameraWebServer example on https instead of http. I started by including esp_https_server.h instead of esp_http_server.h and changing the startCameraServer() function as follows:
void startCameraServer(){
#ifndef _ESP_HTTPS_SERVER_H_
httpd_config_t config = HTTPD_DEFAULT_CONFIG();
#else
httpd_ssl_config config = HTTPD_SSL_CONFIG_DEFAULT();
config.cacert_len = cert->getCertLength();
config.cacert_pem = cert->getCertData();
config.prvtkey_len = cert->getPKLength();
config.prvtkey_pem = cert->getPKData();
#endif
httpd_uri_t index_uri = { .uri = "/", .method = HTTP_GET, .handler = index_handler, .user_ctx = NULL };
httpd_uri_t status_uri = { .uri = "/status", .method = HTTP_GET, .handler = status_handler, .user_ctx = NULL };
httpd_uri_t cmd_uri = { .uri = "/control", .method = HTTP_GET, .handler = cmd_handler, .user_ctx = NULL };
httpd_uri_t capture_uri = { .uri = "/capture", .method = HTTP_GET, .handler = capture_handler, .user_ctx = NULL };
httpd_uri_t stream_uri = { .uri = "/stream", .method = HTTP_GET, .handler = stream_handler, .user_ctx = NULL };
ra_filter_init(&ra_filter, 20);
mtmn_config.type = FAST;
mtmn_config.min_face = 80;
mtmn_config.pyramid = 0.707;
mtmn_config.pyramid_times = 4;
mtmn_config.p_threshold.score = 0.6;
mtmn_config.p_threshold.nms = 0.7;
mtmn_config.p_threshold.candidate_number = 20;
mtmn_config.r_threshold.score = 0.7;
mtmn_config.r_threshold.nms = 0.7;
mtmn_config.r_threshold.candidate_number = 10;
mtmn_config.o_threshold.score = 0.7;
mtmn_config.o_threshold.nms = 0.7;
mtmn_config.o_threshold.candidate_number = 1;
face_id_init(&id_list, FACE_ID_SAVE_NUMBER, ENROLL_CONFIRM_TIMES);
#ifndef _ESP_HTTPS_SERVER_H_
Serial.printf("Starting web server on port: '%d'\n", config.server_port);
if (httpd_start(&camera_httpd, &config) == ESP_OK) {
#else
Serial.printf("Starting web server on port: '%d'\n", config.port_secure);
if (httpd_ssl_start(&camera_httpd, &config) == ESP_OK) {
#endif
httpd_register_uri_handler(camera_httpd, &index_uri);
httpd_register_uri_handler(camera_httpd, &cmd_uri);
httpd_register_uri_handler(camera_httpd, &status_uri);
httpd_register_uri_handler(camera_httpd, &capture_uri);
}
#ifndef _ESP_HTTPS_SERVER_H_
config.server_port += 1;
config.ctrl_port += 1;
Serial.printf("Starting stream server on port: '%d'\n", config.server_port);
if (httpd_start(&stream_httpd, &config) == ESP_OK) {
#else
config.port_secure += 1;
config.httpd.ctrl_port += 1;
Serial.printf("Starting stream server on port: '%d'\n", config.port_secure);
if (httpd_ssl_start(&stream_httpd, &config) == ESP_OK) {
#endif
httpd_register_uri_handler(stream_httpd, &stream_uri);
}
}
If I include esp_http_server.h the original code will compile and everything runs fine. If I include esp_https_server.h the changes will compile and the webserver nicely comes up at port 443. The menu shows and I can get a still from the camera. The only thing that doesn't work is what it's all about: the live stream. The video window shows but only with a broken image icon. I see no messages in the terminal window in PlatformIO or anything in the browser's console. The stream_handler function, defined in stream_uri, is called when using http but not when using https.
My knowledge about webserver software is very minimalistic, I have no idea where to look further.
Does anybody know if I could get this working, any ideas?