The following are a sample of YouTube videos defending the Gospel of John's historical reliability and for being based on eyewitness testimony. For MANY MORE VIDEOS check out the YouTube channels of: Lydia McGrew
Lydia McGrew's YouTube channel has many videos defending the historical reliability and eyewitness basis for all four canonical Gospels. The Same is true for Erik Manning's channel.
For the sake of argument I often will accept Markan Priority when doing apologetics. Even though I'm no longer convinced that Markan Priority is the most likely scenario. The following links to video playlists is by a Mormon who seems to be fairly familiar with the Synoptic Problem/Puzzle. The first video in the playlist arguing for Matthean Priority makes an interesting case for why the evidence suggests GMark (i.e. the Gospel of Mark) was written last among the Synoptics and that it used both GMatt and GLuke as sources. As an Evangelical Christian, I obviously don't endorse the video maker's Mormonism or his case for Mormonism. Nevertheless, his arguments AGAINST Markan Priority, and his case FOR Matthean Priority have some argumentative force.
Gavin Ortlund is one of my favorite Protestant apologists who defends Protestantism against Catholicism, Eastern Orthodoxy (etc.). He also enjoys doing general apologetics in defense of the existence of God. Below is his lecture on why the topic of beauty is an aspect of apologetics that needed and under utilized. His channel is located HERE.
On the Capturing Christianity YouTube channel Cameron Bertuzzi interviews William Lane Craig to comment on Bart Ehrman's interview at Alex O'Connor's Youtube Channel. HERE's the link to the original video of Alex O'Connor interviewing Bart Ehrman.
Below is the video where William Lane Craig is interviewed by Cameron Bertuzzi at Capturing Christianity: