A lot of the free tools that use to work , no longer do. One that was very good was the addon for Chrome and Friefox, Video Download Helper. It’s all because of the security and copyright laws. There are still a few you may have luck with like VLC and use it to capture a stream. If the video is embedded entirely, you might be able to save it by using Firefox and right clik the page > View page info > Media and scroll down to you find the video. Capture YouTube videos has become much tougher and you may need to purchase a device that captures video stream.