If you have a newer smartphone camera, with good planning you can make a video that you will be proud of. Some of the best cameras for video are the iPhone and the Google Pixel. There are others, but I haven’t personally tested them.
Whether you need professional production depends on what you are going to use the video for. For example, if you are going to be making a video for each blog post you do then it might be more cost effective to do-it-yourself. People don’t expect a vlog style video to be ultra-produced.
However, if the video will be featured on your homepage or used as a Facebook or Youtube advertisement then you may want to present a higher quality image and a video producer can help you with that; many times for less than $5000.