I've been a fan of VDH for several years now. It is quite dependable if you're needing a simple video capture tool for all your YouTube viewings, as well as a plethora of other sites.

Once you're wanting to get into the more intermediate needs of HQ vid capturing (4k, and sometimes even vids offering 1080s+60fps) , and converting mp4/flv into audio files, it can get a bit complex for some, with the need to install a separate app to combine efforts with this tool. Not to mention, "you can purchase a DownloadHelper/ConvertHelper license, so converted videos won't hold the DownloadHelper QR code."

Overall, I highly recommend this app if you want a capture tool that has easy to navigate options, and offers premium services if you have the means to pay for it.