Yes, video helps Facebook posts reach more people than any other kind of post or media. And there is research to back this up! SocialBakers.com found adding video to your Facebook posts increases the “organic reach” (verses the paid reach) more than any other media.
Yes, you can shoot a video yourself with your smartphone that is good enough to be considered professional quality. Today, both Apple and Android smartphones can shoot in ultra high definition (UHD) resolution – that’s 3820 by 2160. That is over five times greater than what TV stations were broadcasting in 2003! The reason your video might not look “professional” isn’t because of a smartphone, it’s the poor techniques many people use to shoot.