I think this is a pretty old film. May be a black & white one. A film director tries to makes a horror film in which lead role is played by an old man, who dies later really after shoot is complete due to some health problem. I don't remember much. Anyone knows it?
Tim Burton's Ed Wood from 1994 was a critically acclaimed, black-and-white film about the life of director Ed Wood Jr. who made Plan 9 From Outer Space - a movie often dubbed "worst film ever made". It stars Johnny Depp as Ed Wood and Martin Landau (who won an Oscar for the role) as an aging drug-addicted Bela Lugosi. Ed supported Bela and has been meaning to cast him in one more movie when Bela died; Ed then used the last footage he shot with him in Plan 9 and hired his wife's chiropractor to fill in for him (with his face covered) for the rest of the film. Here's the trailer: