Still photos can be very useful elements in videos. While certainly not the first, Ken Burns’s use of still photos in videos set a new watermark for what stills could accomplish. There are tons of stock photo houses where you can search millions of images. Flickr https://www.flickr.com and Wikipedia https://wikipedia.com allow searches and provide information about any copyright restrictions. You could search for “free stock photos.” You’d find hundreds of sites you could check out, but why not let Google do the work?
No one can beat the ease and speed of a Google search. It seems like it is part of the modern DNA. Here’s a trick that lets Google search for photos you can legally use. Try this: Do a Google search for some image you’d like to use in a video. Let’s say you searched for quadcopter. Then click on images. There are scores of images on the results page, but you can’t just use any of these images in your videos because they are copyrighted. Next click on Search Tools and then Usage Rights. You will see choices such as:
The default search is for “not filtered by license” which gives the most results. All the others allow some amount of reuse. Of the reuse options, you will get more results from images that are labeled noncommercial. But if your project is commercial, just click “labeled for reuse.” You could use any the images, text or video you find which are “labeled for reuse.” Here’s what Google says about finding free-to-use images.